Finding the Fourth Proportional to 1,015.83, 1,401.37 and 622.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.83 : 1,401.37 = 622.77 : x
2. Step 2: Convert to fraction form
   1,015.83/1,401.37 = 622.77/x
3. Step 3: Cross multiply
   1,015.83x = 1,401.37 × 622.77
4. Step 4: Simplify right side
   1,015.83x = 872,731.19
5. Step 5: Solve for x
   x = 872,731.19/1,015.83
6. Step 6: Final answer
   x = 859.13