Finding the Fourth Proportional to 1,016.40, 1,520.72 and 708.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.40 : 1,520.72 = 708.81 : x
2. Step 2: Convert to fraction form
   1,016.40/1,520.72 = 708.81/x
3. Step 3: Cross multiply
   1,016.40x = 1,520.72 × 708.81
4. Step 4: Simplify right side
   1,016.40x = 1,077,901.54
5. Step 5: Solve for x
   x = 1,077,901.54/1,016.40
6. Step 6: Final answer
   x = 1,060.51