Finding the Fourth Proportional to 8,759.16, 12,087.72 and 4,780.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,759.16 : 12,087.72 = 4,780.31 : x
2. Step 2: Convert to fraction form
   8,759.16/12,087.72 = 4,780.31/x
3. Step 3: Cross multiply
   8,759.16x = 12,087.72 × 4,780.31
4. Step 4: Simplify right side
   8,759.16x = 57,782,988.35
5. Step 5: Solve for x
   x = 57,782,988.35/8,759.16
6. Step 6: Final answer
   x = 6,596.86