Finding the Fourth Proportional to 22,688.12, 31,308.72 and 13,127.96

Step by Step Solution

1. Step 1: Write the proportion equation
   22,688.12 : 31,308.72 = 13,127.96 : x
2. Step 2: Convert to fraction form
   22,688.12/31,308.72 = 13,127.96/x
3. Step 3: Cross multiply
   22,688.12x = 31,308.72 × 13,127.96
4. Step 4: Simplify right side
   22,688.12x = 411,019,623.81
5. Step 5: Solve for x
   x = 411,019,623.81/22,688.12
6. Step 6: Final answer
   x = 18,116.07