Finding the Fourth Proportional to 1,120.20, 1,545.89 and 622.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.20 : 1,545.89 = 622.82 : x
2. Step 2: Convert to fraction form
   1,120.20/1,545.89 = 622.82/x
3. Step 3: Cross multiply
   1,120.20x = 1,545.89 × 622.82
4. Step 4: Simplify right side
   1,120.20x = 962,811.96
5. Step 5: Solve for x
   x = 962,811.96/1,120.20
6. Step 6: Final answer
   x = 859.50