Finding the Fourth Proportional to 1,015.32, 1,401.67 and 622.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.32 : 1,401.67 = 622.57 : x
2. Step 2: Convert to fraction form
   1,015.32/1,401.67 = 622.57/x
3. Step 3: Cross multiply
   1,015.32x = 1,401.67 × 622.57
4. Step 4: Simplify right side
   1,015.32x = 872,637.69
5. Step 5: Solve for x
   x = 872,637.69/1,015.32
6. Step 6: Final answer
   x = 859.47