Finding the Fourth Proportional to 6,128.71, 8,457.51 and 3,403.15

Step by Step Solution

1. Step 1: Write the proportion equation
   6,128.71 : 8,457.51 = 3,403.15 : x
2. Step 2: Convert to fraction form
   6,128.71/8,457.51 = 3,403.15/x
3. Step 3: Cross multiply
   6,128.71x = 8,457.51 × 3,403.15
4. Step 4: Simplify right side
   6,128.71x = 28,782,175.16
5. Step 5: Solve for x
   x = 28,782,175.16/6,128.71
6. Step 6: Final answer
   x = 4,696.29