Finding the Fourth Proportional to 1,120.78, 1,545.72 and 722.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.78 : 1,545.72 = 722.52 : x
2. Step 2: Convert to fraction form
   1,120.78/1,545.72 = 722.52/x
3. Step 3: Cross multiply
   1,120.78x = 1,545.72 × 722.52
4. Step 4: Simplify right side
   1,120.78x = 1,116,813.61
5. Step 5: Solve for x
   x = 1,116,813.61/1,120.78
6. Step 6: Final answer
   x = 996.46