Finding the Fourth Proportional to 1,003.31, 1,498.87 and 839.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.31 : 1,498.87 = 839.29 : x
2. Step 2: Convert to fraction form
   1,003.31/1,498.87 = 839.29/x
3. Step 3: Cross multiply
   1,003.31x = 1,498.87 × 839.29
4. Step 4: Simplify right side
   1,003.31x = 1,257,986.60
5. Step 5: Solve for x
   x = 1,257,986.60/1,003.31
6. Step 6: Final answer
   x = 1,253.84