Finding the Fourth Proportional to 22,591.74, 31,178.39 and 12,521.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,591.74 : 31,178.39 = 12,521.15 : x
2. Step 2: Convert to fraction form
   22,591.74/31,178.39 = 12,521.15/x
3. Step 3: Cross multiply
   22,591.74x = 31,178.39 × 12,521.15
4. Step 4: Simplify right side
   22,591.74x = 390,389,079.45
5. Step 5: Solve for x
   x = 390,389,079.45/22,591.74
6. Step 6: Final answer
   x = 17,280.17