Finding the Fourth Proportional to 22,539.10, 31,105.90 and 13,107

Step by Step Solution

1. Step 1: Write the proportion equation
   22,539.10 : 31,105.90 = 13,107 : x
2. Step 2: Convert to fraction form
   22,539.10/31,105.90 = 13,107/x
3. Step 3: Cross multiply
   22,539.10x = 31,105.90 × 13,107
4. Step 4: Simplify right side
   22,539.10x = 407,705,031.30
5. Step 5: Solve for x
   x = 407,705,031.30/22,539.10
6. Step 6: Final answer
   x = 18,088.79