Finding the Fourth Proportional to 1,061.17, 1,464.15 and 618.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.17 : 1,464.15 = 618.91 : x
2. Step 2: Convert to fraction form
   1,061.17/1,464.15 = 618.91/x
3. Step 3: Cross multiply
   1,061.17x = 1,464.15 × 618.91
4. Step 4: Simplify right side
   1,061.17x = 906,177.08
5. Step 5: Solve for x
   x = 906,177.08/1,061.17
6. Step 6: Final answer
   x = 853.94