Finding the Fourth Proportional to 6,128.71, 8,455.09 and 4,003.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,128.71 : 8,455.09 = 4,003.50 : x
2. Step 2: Convert to fraction form
   6,128.71/8,455.09 = 4,003.50/x
3. Step 3: Cross multiply
   6,128.71x = 8,455.09 × 4,003.50
4. Step 4: Simplify right side
   6,128.71x = 33,849,952.82
5. Step 5: Solve for x
   x = 33,849,952.82/6,128.71
6. Step 6: Final answer
   x = 5,523.18