Finding the Fourth Proportional to 1,665.43, 2,499.28 and 1,078.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.43 : 2,499.28 = 1,078.97 : x
2. Step 2: Convert to fraction form
   1,665.43/2,499.28 = 1,078.97/x
3. Step 3: Cross multiply
   1,665.43x = 2,499.28 × 1,078.97
4. Step 4: Simplify right side
   1,665.43x = 2,696,632.95
5. Step 5: Solve for x
   x = 2,696,632.95/1,665.43
6. Step 6: Final answer
   x = 1,619.18