Finding the Fourth Proportional to 22,129.12, 30,535.68 and 12,700.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,129.12 : 30,535.68 = 12,700.72 : x
2. Step 2: Convert to fraction form
   22,129.12/30,535.68 = 12,700.72/x
3. Step 3: Cross multiply
   22,129.12x = 30,535.68 × 12,700.72
4. Step 4: Simplify right side
   22,129.12x = 387,825,121.69
5. Step 5: Solve for x
   x = 387,825,121.69/22,129.12
6. Step 6: Final answer
   x = 17,525.56