Finding the Fourth Proportional to 1,015.89, 1,401.96 and 622.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.89 : 1,401.96 = 622.69 : x
2. Step 2: Convert to fraction form
   1,015.89/1,401.96 = 622.69/x
3. Step 3: Cross multiply
   1,015.89x = 1,401.96 × 622.69
4. Step 4: Simplify right side
   1,015.89x = 872,981.80
5. Step 5: Solve for x
   x = 872,981.80/1,015.89
6. Step 6: Final answer
   x = 859.33