Finding the Fourth Proportional to 22,624.32, 31,220.72 and 12,553.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,624.32 : 31,220.72 = 12,553.20 : x
2. Step 2: Convert to fraction form
   22,624.32/31,220.72 = 12,553.20/x
3. Step 3: Cross multiply
   22,624.32x = 31,220.72 × 12,553.20
4. Step 4: Simplify right side
   22,624.32x = 391,919,942.30
5. Step 5: Solve for x
   x = 391,919,942.30/22,624.32
6. Step 6: Final answer
   x = 17,322.95