Finding the Fourth Proportional to 21,123.01, 31,654.91 and 16,421.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.01 : 31,654.91 = 16,421.50 : x
2. Step 2: Convert to fraction form
   21,123.01/31,654.91 = 16,421.50/x
3. Step 3: Cross multiply
   21,123.01x = 31,654.91 × 16,421.50
4. Step 4: Simplify right side
   21,123.01x = 519,821,022.46
5. Step 5: Solve for x
   x = 519,821,022.46/21,123.01
6. Step 6: Final answer
   x = 24,609.23