Finding the Fourth Proportional to 8,757.30, 12,084.72 and 4,778.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,757.30 : 12,084.72 = 4,778.31 : x
2. Step 2: Convert to fraction form
   8,757.30/12,084.72 = 4,778.31/x
3. Step 3: Cross multiply
   8,757.30x = 12,084.72 × 4,778.31
4. Step 4: Simplify right side
   8,757.30x = 57,744,538.42
5. Step 5: Solve for x
   x = 57,744,538.42/8,757.30
6. Step 6: Final answer
   x = 6,593.87