Finding the Fourth Proportional to 23,142.71, 31,938.15 and 15,189.59

Step by Step Solution

1. Step 1: Write the proportion equation
   23,142.71 : 31,938.15 = 15,189.59 : x
2. Step 2: Convert to fraction form
   23,142.71/31,938.15 = 15,189.59/x
3. Step 3: Cross multiply
   23,142.71x = 31,938.15 × 15,189.59
4. Step 4: Simplify right side
   23,142.71x = 485,127,403.86
5. Step 5: Solve for x
   x = 485,127,403.86/23,142.71
6. Step 6: Final answer
   x = 20,962.43