Finding the Fourth Proportional to 1,665.47, 2,498.60 and 691.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.47 : 2,498.60 = 691.04 : x
2. Step 2: Convert to fraction form
   1,665.47/2,498.60 = 691.04/x
3. Step 3: Cross multiply
   1,665.47x = 2,498.60 × 691.04
4. Step 4: Simplify right side
   1,665.47x = 1,726,621.78
5. Step 5: Solve for x
   x = 1,726,621.78/1,665.47
6. Step 6: Final answer
   x = 1,036.72