Finding the Fourth Proportional to 1,127.67, 1,557.15 and 708.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.67 : 1,557.15 = 708.72 : x
2. Step 2: Convert to fraction form
   1,127.67/1,557.15 = 708.72/x
3. Step 3: Cross multiply
   1,127.67x = 1,557.15 × 708.72
4. Step 4: Simplify right side
   1,127.67x = 1,103,589.98
5. Step 5: Solve for x
   x = 1,103,589.98/1,127.67
6. Step 6: Final answer
   x = 978.64