Finding the Fourth Proportional to 1,085.20, 1,626.72 and 622.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.20 : 1,626.72 = 622.42 : x
2. Step 2: Convert to fraction form
   1,085.20/1,626.72 = 622.42/x
3. Step 3: Cross multiply
   1,085.20x = 1,626.72 × 622.42
4. Step 4: Simplify right side
   1,085.20x = 1,012,503.06
5. Step 5: Solve for x
   x = 1,012,503.06/1,085.20
6. Step 6: Final answer
   x = 933.01