Finding the Fourth Proportional to 22,688.64, 31,308.50 and 12,616.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,688.64 : 31,308.50 = 12,616.30 : x
2. Step 2: Convert to fraction form
   22,688.64/31,308.50 = 12,616.30/x
3. Step 3: Cross multiply
   22,688.64x = 31,308.50 × 12,616.30
4. Step 4: Simplify right side
   22,688.64x = 394,997,428.55
5. Step 5: Solve for x
   x = 394,997,428.55/22,688.64
6. Step 6: Final answer
   x = 17,409.48