Finding the Fourth Proportional to 1,664.55, 2,496.42 and 689.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,664.55 : 2,496.42 = 689.72 : x
2. Step 2: Convert to fraction form
   1,664.55/2,496.42 = 689.72/x
3. Step 3: Cross multiply
   1,664.55x = 2,496.42 × 689.72
4. Step 4: Simplify right side
   1,664.55x = 1,721,818.32
5. Step 5: Solve for x
   x = 1,721,818.32/1,664.55
6. Step 6: Final answer
   x = 1,034.40