Finding the Fourth Proportional to 1,081.17, 1,492.70 and 708.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.17 : 1,492.70 = 708.69 : x
2. Step 2: Convert to fraction form
   1,081.17/1,492.70 = 708.69/x
3. Step 3: Cross multiply
   1,081.17x = 1,492.70 × 708.69
4. Step 4: Simplify right side
   1,081.17x = 1,057,858.02
5. Step 5: Solve for x
   x = 1,057,858.02/1,081.17
6. Step 6: Final answer
   x = 978.44