Finding the Fourth Proportional to 1,610.52, 2,415.28 and 686.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.52 : 2,415.28 = 686.04 : x
2. Step 2: Convert to fraction form
   1,610.52/2,415.28 = 686.04/x
3. Step 3: Cross multiply
   1,610.52x = 2,415.28 × 686.04
4. Step 4: Simplify right side
   1,610.52x = 1,656,978.69
5. Step 5: Solve for x
   x = 1,656,978.69/1,610.52
6. Step 6: Final answer
   x = 1,028.85