Finding the Fourth Proportional to 3,803.59, 5,255.59 and 3,139.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,803.59 : 5,255.59 = 3,139.28 : x
2. Step 2: Convert to fraction form
   3,803.59/5,255.59 = 3,139.28/x
3. Step 3: Cross multiply
   3,803.59x = 5,255.59 × 3,139.28
4. Step 4: Simplify right side
   3,803.59x = 16,498,798.63
5. Step 5: Solve for x
   x = 16,498,798.63/3,803.59
6. Step 6: Final answer
   x = 4,337.70