Finding the Fourth Proportional to 6,758.88, 10,140.78 and 4,158.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,758.88 : 10,140.78 = 4,158.78 : x
2. Step 2: Convert to fraction form
   6,758.88/10,140.78 = 4,158.78/x
3. Step 3: Cross multiply
   6,758.88x = 10,140.78 × 4,158.78
4. Step 4: Simplify right side
   6,758.88x = 42,173,273.05
5. Step 5: Solve for x
   x = 42,173,273.05/6,758.88
6. Step 6: Final answer
   x = 6,239.68