Finding the Fourth Proportional to 1,064.79, 1,469.48 and 622.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.79 : 1,469.48 = 622.80 : x
2. Step 2: Convert to fraction form
   1,064.79/1,469.48 = 622.80/x
3. Step 3: Cross multiply
   1,064.79x = 1,469.48 × 622.80
4. Step 4: Simplify right side
   1,064.79x = 915,189.03
5. Step 5: Solve for x
   x = 915,189.03/1,064.79
6. Step 6: Final answer
   x = 859.50