Finding the Fourth Proportional to 1,066.57, 1,472.06 and 618.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.57 : 1,472.06 = 618.71 : x
2. Step 2: Convert to fraction form
   1,066.57/1,472.06 = 618.71/x
3. Step 3: Cross multiply
   1,066.57x = 1,472.06 × 618.71
4. Step 4: Simplify right side
   1,066.57x = 910,772.43
5. Step 5: Solve for x
   x = 910,772.43/1,066.57
6. Step 6: Final answer
   x = 853.93