Albert Barnes Commentary 1 Chronicles 22:14

"Now, behold, in my affliction I have prepared for the house of Jehovah a hundred thousand talents of gold, and a thousand thousand talents of silver, and of brass and iron without weight; for it is in abundance: timber also and stone have I prepared; and thou mayest add thereto." — 1 Chronicles 22:14 (ASV)

In my trouble - See the margin. David refers to the numerous troubles of his reign, which had prevented him from accumulating very much treasure.

A hundred thousand talents of gold... We do not know the value of the Hebrew talent at this period, and therefore these numbers may be sound. In that case, however, we must suppose an enormous difference between the pre-Babylonian and the post-Babylonian talents. According to the value of the post-Babylonian Hebrew talent, the gold mentioned here would be worth more than one billion British pounds sterling, while the silver would be worth above 400 million pounds. Accumulations of anything like this amount are inconceivable under the circumstances. We must, therefore, either suppose the talents of David’s time to have been little more than one-hundredth the value of the later talents, or regard the numbers in this verse as having been augmented at least a hundredfold by corruption. Of the two possibilities, the latter is certainly the more probable supposition.