Finding the Fourth Proportional to 1,665.15, 2,498.01 and 691.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.15 : 2,498.01 = 691.32 : x
2. Step 2: Convert to fraction form
   1,665.15/2,498.01 = 691.32/x
3. Step 3: Cross multiply
   1,665.15x = 2,498.01 × 691.32
4. Step 4: Simplify right side
   1,665.15x = 1,726,924.27
5. Step 5: Solve for x
   x = 1,726,924.27/1,665.15
6. Step 6: Final answer
   x = 1,037.10