Finding the Fourth Proportional to 23,139.07, 31,932.02 and 12,528.78

Step by Step Solution

1. Step 1: Write the proportion equation
   23,139.07 : 31,932.02 = 12,528.78 : x
2. Step 2: Convert to fraction form
   23,139.07/31,932.02 = 12,528.78/x
3. Step 3: Cross multiply
   23,139.07x = 31,932.02 × 12,528.78
4. Step 4: Simplify right side
   23,139.07x = 400,069,165.11
5. Step 5: Solve for x
   x = 400,069,165.11/23,139.07
6. Step 6: Final answer
   x = 17,289.77