Finding the Fourth Proportional to 22,587.28, 31,167.25 and 12,516.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,587.28 : 31,167.25 = 12,516.30 : x
2. Step 2: Convert to fraction form
   22,587.28/31,167.25 = 12,516.30/x
3. Step 3: Cross multiply
   22,587.28x = 31,167.25 × 12,516.30
4. Step 4: Simplify right side
   22,587.28x = 390,098,619.88
5. Step 5: Solve for x
   x = 390,098,619.88/22,587.28
6. Step 6: Final answer
   x = 17,270.72