Finding the Fourth Proportional to 9,128.85, 12,597.89 and 5,040.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.85 : 12,597.89 = 5,040.78 : x
2. Step 2: Convert to fraction form
   9,128.85/12,597.89 = 5,040.78/x
3. Step 3: Cross multiply
   9,128.85x = 12,597.89 × 5,040.78
4. Step 4: Simplify right side
   9,128.85x = 63,503,191.95
5. Step 5: Solve for x
   x = 63,503,191.95/9,128.85
6. Step 6: Final answer
   x = 6,956.32