Finding the Fourth Proportional to 1,665.54, 2,500.38 and 1,078.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.54 : 2,500.38 = 1,078.62 : x
2. Step 2: Convert to fraction form
   1,665.54/2,500.38 = 1,078.62/x
3. Step 3: Cross multiply
   1,665.54x = 2,500.38 × 1,078.62
4. Step 4: Simplify right side
   1,665.54x = 2,696,959.88
5. Step 5: Solve for x
   x = 2,696,959.88/1,665.54
6. Step 6: Final answer
   x = 1,619.27