Finding the Fourth Proportional to 1,064.89, 1,469.55 and 622.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.89 : 1,469.55 = 622.71 : x
2. Step 2: Convert to fraction form
   1,064.89/1,469.55 = 622.71/x
3. Step 3: Cross multiply
   1,064.89x = 1,469.55 × 622.71
4. Step 4: Simplify right side
   1,064.89x = 915,103.48
5. Step 5: Solve for x
   x = 915,103.48/1,064.89
6. Step 6: Final answer
   x = 859.34