Finding the Fourth Proportional to 22,931.47, 34,400.62 and 8,139.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,931.47 : 34,400.62 = 8,139.15 : x
2. Step 2: Convert to fraction form
   22,931.47/34,400.62 = 8,139.15/x
3. Step 3: Cross multiply
   22,931.47x = 34,400.62 × 8,139.15
4. Step 4: Simplify right side
   22,931.47x = 279,991,806.27
5. Step 5: Solve for x
   x = 279,991,806.27/22,931.47
6. Step 6: Final answer
   x = 12,209.94