Finding the Fourth Proportional to 23,139.30, 31,932.18 and 12,528.93

Step by Step Solution

1. Step 1: Write the proportion equation
   23,139.30 : 31,932.18 = 12,528.93 : x
2. Step 2: Convert to fraction form
   23,139.30/31,932.18 = 12,528.93/x
3. Step 3: Cross multiply
   23,139.30x = 31,932.18 × 12,528.93
4. Step 4: Simplify right side
   23,139.30x = 400,076,047.97
5. Step 5: Solve for x
   x = 400,076,047.97/23,139.30
6. Step 6: Final answer
   x = 17,289.89