Finding the Fourth Proportional to 1,016.12, 1,401.90 and 622.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.12 : 1,401.90 = 622.84 : x
2. Step 2: Convert to fraction form
   1,016.12/1,401.90 = 622.84/x
3. Step 3: Cross multiply
   1,016.12x = 1,401.90 × 622.84
4. Step 4: Simplify right side
   1,016.12x = 873,159.40
5. Step 5: Solve for x
   x = 873,159.40/1,016.12
6. Step 6: Final answer
   x = 859.31