Finding the Fourth Proportional to 1,665.03, 2,492.90 and 1,078.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.03 : 2,492.90 = 1,078.58 : x
2. Step 2: Convert to fraction form
   1,665.03/2,492.90 = 1,078.58/x
3. Step 3: Cross multiply
   1,665.03x = 2,492.90 × 1,078.58
4. Step 4: Simplify right side
   1,665.03x = 2,688,796.97
5. Step 5: Solve for x
   x = 2,688,796.97/1,665.03
6. Step 6: Final answer
   x = 1,614.86