Finding the Fourth Proportional to 1,610.61, 2,417.06 and 686.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.61 : 2,417.06 = 686.41 : x
2. Step 2: Convert to fraction form
   1,610.61/2,417.06 = 686.41/x
3. Step 3: Cross multiply
   1,610.61x = 2,417.06 × 686.41
4. Step 4: Simplify right side
   1,610.61x = 1,659,094.15
5. Step 5: Solve for x
   x = 1,659,094.15/1,610.61
6. Step 6: Final answer
   x = 1,030.10