Finding the Fourth Proportional to 15,499.41, 21,389.31 and 8,425.82

Step by Step Solution

1. Step 1: Write the proportion equation
   15,499.41 : 21,389.31 = 8,425.82 : x
2. Step 2: Convert to fraction form
   15,499.41/21,389.31 = 8,425.82/x
3. Step 3: Cross multiply
   15,499.41x = 21,389.31 × 8,425.82
4. Step 4: Simplify right side
   15,499.41x = 180,222,475.98
5. Step 5: Solve for x
   x = 180,222,475.98/15,499.41
6. Step 6: Final answer
   x = 11,627.70