Finding the Fourth Proportional to 1,003.59, 1,385.10 and 865.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.59 : 1,385.10 = 865.08 : x
2. Step 2: Convert to fraction form
   1,003.59/1,385.10 = 865.08/x
3. Step 3: Cross multiply
   1,003.59x = 1,385.10 × 865.08
4. Step 4: Simplify right side
   1,003.59x = 1,198,222.31
5. Step 5: Solve for x
   x = 1,198,222.31/1,003.59
6. Step 6: Final answer
   x = 1,193.94