Finding the Fourth Proportional to 1,281.25, 1,920.69 and 622.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.25 : 1,920.69 = 622.72 : x
2. Step 2: Convert to fraction form
   1,281.25/1,920.69 = 622.72/x
3. Step 3: Cross multiply
   1,281.25x = 1,920.69 × 622.72
4. Step 4: Simplify right side
   1,281.25x = 1,196,052.08
5. Step 5: Solve for x
   x = 1,196,052.08/1,281.25
6. Step 6: Final answer
   x = 933.50