Finding the Fourth Proportional to 1,003.98, 1,385.55 and 611.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.98 : 1,385.55 = 611.04 : x
2. Step 2: Convert to fraction form
   1,003.98/1,385.55 = 611.04/x
3. Step 3: Cross multiply
   1,003.98x = 1,385.55 × 611.04
4. Step 4: Simplify right side
   1,003.98x = 846,626.47
5. Step 5: Solve for x
   x = 846,626.47/1,003.98
6. Step 6: Final answer
   x = 843.27