Finding the Fourth Proportional to 15,724.55, 21,700.17 and 8,650.82

Step by Step Solution

1. Step 1: Write the proportion equation
   15,724.55 : 21,700.17 = 8,650.82 : x
2. Step 2: Convert to fraction form
   15,724.55/21,700.17 = 8,650.82/x
3. Step 3: Cross multiply
   15,724.55x = 21,700.17 × 8,650.82
4. Step 4: Simplify right side
   15,724.55x = 187,724,318.89
5. Step 5: Solve for x
   x = 187,724,318.89/15,724.55
6. Step 6: Final answer
   x = 11,938.29