Finding the Fourth Proportional to 1,080.42, 1,492.61 and 708.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.42 : 1,492.61 = 708.29 : x
2. Step 2: Convert to fraction form
   1,080.42/1,492.61 = 708.29/x
3. Step 3: Cross multiply
   1,080.42x = 1,492.61 × 708.29
4. Step 4: Simplify right side
   1,080.42x = 1,057,189.73
5. Step 5: Solve for x
   x = 1,057,189.73/1,080.42
6. Step 6: Final answer
   x = 978.50