Finding the Fourth Proportional to 1,081.56, 1,492.16 and 708.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.56 : 1,492.16 = 708.96 : x
2. Step 2: Convert to fraction form
   1,081.56/1,492.16 = 708.96/x
3. Step 3: Cross multiply
   1,081.56x = 1,492.16 × 708.96
4. Step 4: Simplify right side
   1,081.56x = 1,057,881.75
5. Step 5: Solve for x
   x = 1,057,881.75/1,081.56
6. Step 6: Final answer
   x = 978.11