Finding the Fourth Proportional to 1,081.89, 1,492.61 and 709.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.89 : 1,492.61 = 709.29 : x
2. Step 2: Convert to fraction form
   1,081.89/1,492.61 = 709.29/x
3. Step 3: Cross multiply
   1,081.89x = 1,492.61 × 709.29
4. Step 4: Simplify right side
   1,081.89x = 1,058,689.80
5. Step 5: Solve for x
   x = 1,058,689.80/1,081.89
6. Step 6: Final answer
   x = 978.56