Finding the Fourth Proportional to 15,572.72, 21,490.82 and 8,499.60

Step by Step Solution

1. Step 1: Write the proportion equation
   15,572.72 : 21,490.82 = 8,499.60 : x
2. Step 2: Convert to fraction form
   15,572.72/21,490.82 = 8,499.60/x
3. Step 3: Cross multiply
   15,572.72x = 21,490.82 × 8,499.60
4. Step 4: Simplify right side
   15,572.72x = 182,663,373.67
5. Step 5: Solve for x
   x = 182,663,373.67/15,572.72
6. Step 6: Final answer
   x = 11,729.70