Finding the Fourth Proportional to 6,128.18, 8,457.77 and 3,439.69

Step by Step Solution

1. Step 1: Write the proportion equation
   6,128.18 : 8,457.77 = 3,439.69 : x
2. Step 2: Convert to fraction form
   6,128.18/8,457.77 = 3,439.69/x
3. Step 3: Cross multiply
   6,128.18x = 8,457.77 × 3,439.69
4. Step 4: Simplify right side
   6,128.18x = 29,092,047.40
5. Step 5: Solve for x
   x = 29,092,047.40/6,128.18
6. Step 6: Final answer
   x = 4,747.26