Finding the Fourth Proportional to 1,146.18, 1,581.72 and 622.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.18 : 1,581.72 = 622.20 : x
2. Step 2: Convert to fraction form
   1,146.18/1,581.72 = 622.20/x
3. Step 3: Cross multiply
   1,146.18x = 1,581.72 × 622.20
4. Step 4: Simplify right side
   1,146.18x = 984,146.18
5. Step 5: Solve for x
   x = 984,146.18/1,146.18
6. Step 6: Final answer
   x = 858.63