Finding the Fourth Proportional to 1,015.39, 1,401.35 and 622.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.39 : 1,401.35 = 622.49 : x
2. Step 2: Convert to fraction form
   1,015.39/1,401.35 = 622.49/x
3. Step 3: Cross multiply
   1,015.39x = 1,401.35 × 622.49
4. Step 4: Simplify right side
   1,015.39x = 872,319.74
5. Step 5: Solve for x
   x = 872,319.74/1,015.39
6. Step 6: Final answer
   x = 859.10