Finding the Fourth Proportional to 1,015.98, 1,401.90 and 622.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.98 : 1,401.90 = 622.94 : x
2. Step 2: Convert to fraction form
   1,015.98/1,401.90 = 622.94/x
3. Step 3: Cross multiply
   1,015.98x = 1,401.90 × 622.94
4. Step 4: Simplify right side
   1,015.98x = 873,292.58
5. Step 5: Solve for x
   x = 873,292.58/1,015.98
6. Step 6: Final answer
   x = 859.56