Finding the Fourth Proportional to 1,066.58, 1,471.83 and 618.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.58 : 1,471.83 = 618.38 : x
2. Step 2: Convert to fraction form
   1,066.58/1,471.83 = 618.38/x
3. Step 3: Cross multiply
   1,066.58x = 1,471.83 × 618.38
4. Step 4: Simplify right side
   1,066.58x = 910,143.68
5. Step 5: Solve for x
   x = 910,143.68/1,066.58
6. Step 6: Final answer
   x = 853.33