Finding the Fourth Proportional to 1,015.38, 1,401.25 and 622.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.38 : 1,401.25 = 622.62 : x
2. Step 2: Convert to fraction form
   1,015.38/1,401.25 = 622.62/x
3. Step 3: Cross multiply
   1,015.38x = 1,401.25 × 622.62
4. Step 4: Simplify right side
   1,015.38x = 872,446.28
5. Step 5: Solve for x
   x = 872,446.28/1,015.38
6. Step 6: Final answer
   x = 859.23