Finding the Fourth Proportional to 1,015.48, 1,401.06 and 622.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.48 : 1,401.06 = 622.12 : x
2. Step 2: Convert to fraction form
   1,015.48/1,401.06 = 622.12/x
3. Step 3: Cross multiply
   1,015.48x = 1,401.06 × 622.12
4. Step 4: Simplify right side
   1,015.48x = 871,627.45
5. Step 5: Solve for x
   x = 871,627.45/1,015.48
6. Step 6: Final answer
   x = 858.34