Finding the Fourth Proportional to 1,014.78, 1,401.12 and 622.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.78 : 1,401.12 = 622.32 : x
2. Step 2: Convert to fraction form
   1,014.78/1,401.12 = 622.32/x
3. Step 3: Cross multiply
   1,014.78x = 1,401.12 × 622.32
4. Step 4: Simplify right side
   1,014.78x = 871,945.00
5. Step 5: Solve for x
   x = 871,945.00/1,014.78
6. Step 6: Final answer
   x = 859.25