Finding the Fourth Proportional to 1,665.55, 2,497.92 and 690.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.55 : 2,497.92 = 690.72 : x
2. Step 2: Convert to fraction form
   1,665.55/2,497.92 = 690.72/x
3. Step 3: Cross multiply
   1,665.55x = 2,497.92 × 690.72
4. Step 4: Simplify right side
   1,665.55x = 1,725,363.30
5. Step 5: Solve for x
   x = 1,725,363.30/1,665.55
6. Step 6: Final answer
   x = 1,035.91