Finding the Fourth Proportional to 1,015.27, 1,401.11 and 622.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.27 : 1,401.11 = 622.69 : x
2. Step 2: Convert to fraction form
   1,015.27/1,401.11 = 622.69/x
3. Step 3: Cross multiply
   1,015.27x = 1,401.11 × 622.69
4. Step 4: Simplify right side
   1,015.27x = 872,454.07
5. Step 5: Solve for x
   x = 872,454.07/1,015.27
6. Step 6: Final answer
   x = 859.33