Finding the Fourth Proportional to 1,081.71, 1,492.88 and 708.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.71 : 1,492.88 = 708.78 : x
2. Step 2: Convert to fraction form
   1,081.71/1,492.88 = 708.78/x
3. Step 3: Cross multiply
   1,081.71x = 1,492.88 × 708.78
4. Step 4: Simplify right side
   1,081.71x = 1,058,119.94
5. Step 5: Solve for x
   x = 1,058,119.94/1,081.71
6. Step 6: Final answer
   x = 978.19