Finding the Fourth Proportional to 1,081.47, 1,492.57 and 708.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.47 : 1,492.57 = 708.76 : x
2. Step 2: Convert to fraction form
   1,081.47/1,492.57 = 708.76/x
3. Step 3: Cross multiply
   1,081.47x = 1,492.57 × 708.76
4. Step 4: Simplify right side
   1,081.47x = 1,057,873.91
5. Step 5: Solve for x
   x = 1,057,873.91/1,081.47
6. Step 6: Final answer
   x = 978.18