Finding the Fourth Proportional to 6,115.64, 8,442.16 and 4,128.89

Step by Step Solution

1. Step 1: Write the proportion equation
   6,115.64 : 8,442.16 = 4,128.89 : x
2. Step 2: Convert to fraction form
   6,115.64/8,442.16 = 4,128.89/x
3. Step 3: Cross multiply
   6,115.64x = 8,442.16 × 4,128.89
4. Step 4: Simplify right side
   6,115.64x = 34,856,723.27
5. Step 5: Solve for x
   x = 34,856,723.27/6,115.64
6. Step 6: Final answer
   x = 5,699.61