Finding the Fourth Proportional to 1,032.72, 1,424.72 and 618.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,032.72 : 1,424.72 = 618.72 : x
2. Step 2: Convert to fraction form
   1,032.72/1,424.72 = 618.72/x
3. Step 3: Cross multiply
   1,032.72x = 1,424.72 × 618.72
4. Step 4: Simplify right side
   1,032.72x = 881,502.76
5. Step 5: Solve for x
   x = 881,502.76/1,032.72
6. Step 6: Final answer
   x = 853.57