Finding the Fourth Proportional to 1,065.20, 1,469.51 and 622.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.20 : 1,469.51 = 622.91 : x
2. Step 2: Convert to fraction form
   1,065.20/1,469.51 = 622.91/x
3. Step 3: Cross multiply
   1,065.20x = 1,469.51 × 622.91
4. Step 4: Simplify right side
   1,065.20x = 915,367.52
5. Step 5: Solve for x
   x = 915,367.52/1,065.20
6. Step 6: Final answer
   x = 859.34