Finding the Fourth Proportional to 1,666.26, 2,498.82 and 691.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,666.26 : 2,498.82 = 691.86 : x
2. Step 2: Convert to fraction form
   1,666.26/2,498.82 = 691.86/x
3. Step 3: Cross multiply
   1,666.26x = 2,498.82 × 691.86
4. Step 4: Simplify right side
   1,666.26x = 1,728,833.61
5. Step 5: Solve for x
   x = 1,728,833.61/1,666.26
6. Step 6: Final answer
   x = 1,037.55