Finding the Fourth Proportional to 8,978.72, 12,380.38 and 6,737.04

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.72 : 12,380.38 = 6,737.04 : x
2. Step 2: Convert to fraction form
   8,978.72/12,380.38 = 6,737.04/x
3. Step 3: Cross multiply
   8,978.72x = 12,380.38 × 6,737.04
4. Step 4: Simplify right side
   8,978.72x = 83,407,098.43
5. Step 5: Solve for x
   x = 83,407,098.43/8,978.72
6. Step 6: Final answer
   x = 9,289.42