Finding the Fourth Proportional to 1,078.72, 1,489.24 and 706.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.72 : 1,489.24 = 706.08 : x
2. Step 2: Convert to fraction form
   1,078.72/1,489.24 = 706.08/x
3. Step 3: Cross multiply
   1,078.72x = 1,489.24 × 706.08
4. Step 4: Simplify right side
   1,078.72x = 1,051,520.81
5. Step 5: Solve for x
   x = 1,051,520.81/1,078.72
6. Step 6: Final answer
   x = 974.79