Finding the Fourth Proportional to 8,487.39, 12,732.50 and 3,557.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,487.39 : 12,732.50 = 3,557.40 : x
2. Step 2: Convert to fraction form
   8,487.39/12,732.50 = 3,557.40/x
3. Step 3: Cross multiply
   8,487.39x = 12,732.50 × 3,557.40
4. Step 4: Simplify right side
   8,487.39x = 45,294,577.71
5. Step 5: Solve for x
   x = 45,294,577.71/8,487.39
6. Step 6: Final answer
   x = 5,336.69