Finding the Fourth Proportional to 31,008.90, 42,792.42 and 16,861.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,008.90 : 42,792.42 = 16,861.68 : x
2. Step 2: Convert to fraction form
   31,008.90/42,792.42 = 16,861.68/x
3. Step 3: Cross multiply
   31,008.90x = 42,792.42 × 16,861.68
4. Step 4: Simplify right side
   31,008.90x = 721,552,092.47
5. Step 5: Solve for x
   x = 721,552,092.47/31,008.90
6. Step 6: Final answer
   x = 23,269.19