Finding the Fourth Proportional to 1,665.84, 2,499.17 and 691.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.84 : 2,499.17 = 691.41 : x
2. Step 2: Convert to fraction form
   1,665.84/2,499.17 = 691.41/x
3. Step 3: Cross multiply
   1,665.84x = 2,499.17 × 691.41
4. Step 4: Simplify right side
   1,665.84x = 1,727,947.67
5. Step 5: Solve for x
   x = 1,727,947.67/1,665.84
6. Step 6: Final answer
   x = 1,037.28