Finding the Fourth Proportional to 1,665.52, 2,498.70 and 691.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.52 : 2,498.70 = 691.42 : x
2. Step 2: Convert to fraction form
   1,665.52/2,498.70 = 691.42/x
3. Step 3: Cross multiply
   1,665.52x = 2,498.70 × 691.42
4. Step 4: Simplify right side
   1,665.52x = 1,727,651.15
5. Step 5: Solve for x
   x = 1,727,651.15/1,665.52
6. Step 6: Final answer
   x = 1,037.30