Finding the Fourth Proportional to 8,759.38, 12,087.90 and 4,780.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,759.38 : 12,087.90 = 4,780.72 : x
2. Step 2: Convert to fraction form
   8,759.38/12,087.90 = 4,780.72/x
3. Step 3: Cross multiply
   8,759.38x = 12,087.90 × 4,780.72
4. Step 4: Simplify right side
   8,759.38x = 57,788,865.29
5. Step 5: Solve for x
   x = 57,788,865.29/8,759.38
6. Step 6: Final answer
   x = 6,597.37