Finding the Fourth Proportional to 1,146.17, 1,581.72 and 622.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.17 : 1,581.72 = 622.21 : x
2. Step 2: Convert to fraction form
   1,146.17/1,581.72 = 622.21/x
3. Step 3: Cross multiply
   1,146.17x = 1,581.72 × 622.21
4. Step 4: Simplify right side
   1,146.17x = 984,162.00
5. Step 5: Solve for x
   x = 984,162.00/1,146.17
6. Step 6: Final answer
   x = 858.65