Finding the Fourth Proportional to 1,424.17, 2,133.25 and 728.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,424.17 : 2,133.25 = 728.72 : x
2. Step 2: Convert to fraction form
   1,424.17/2,133.25 = 728.72/x
3. Step 3: Cross multiply
   1,424.17x = 2,133.25 × 728.72
4. Step 4: Simplify right side
   1,424.17x = 1,554,541.94
5. Step 5: Solve for x
   x = 1,554,541.94/1,424.17
6. Step 6: Final answer
   x = 1,091.54