Finding the Fourth Proportional to 8,387.15, 12,578.90 and 5,088.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,387.15 : 12,578.90 = 5,088.42 : x
2. Step 2: Convert to fraction form
   8,387.15/12,578.90 = 5,088.42/x
3. Step 3: Cross multiply
   8,387.15x = 12,578.90 × 5,088.42
4. Step 4: Simplify right side
   8,387.15x = 64,006,700.90
5. Step 5: Solve for x
   x = 64,006,700.90/8,387.15
6. Step 6: Final answer
   x = 7,631.52