Finding the Fourth Proportional to 1,089.25, 1,632.25 and 722.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.25 : 1,632.25 = 722.72 : x
2. Step 2: Convert to fraction form
   1,089.25/1,632.25 = 722.72/x
3. Step 3: Cross multiply
   1,089.25x = 1,632.25 × 722.72
4. Step 4: Simplify right side
   1,089.25x = 1,179,664.70
5. Step 5: Solve for x
   x = 1,179,664.70/1,089.25
6. Step 6: Final answer
   x = 1,083.01