Finding the Fourth Proportional to 1,060.78, 1,464.37 and 618.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,060.78 : 1,464.37 = 618.61 : x
2. Step 2: Convert to fraction form
   1,060.78/1,464.37 = 618.61/x
3. Step 3: Cross multiply
   1,060.78x = 1,464.37 × 618.61
4. Step 4: Simplify right side
   1,060.78x = 905,868.72
5. Step 5: Solve for x
   x = 905,868.72/1,060.78
6. Step 6: Final answer
   x = 853.97