Finding the Fourth Proportional to 1,610.17, 2,221.41 and 1,086.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.17 : 2,221.41 = 1,086.55 : x
2. Step 2: Convert to fraction form
   1,610.17/2,221.41 = 1,086.55/x
3. Step 3: Cross multiply
   1,610.17x = 2,221.41 × 1,086.55
4. Step 4: Simplify right side
   1,610.17x = 2,413,673.04
5. Step 5: Solve for x
   x = 2,413,673.04/1,610.17
6. Step 6: Final answer
   x = 1,499.02