Finding the Fourth Proportional to 1,064.78, 1,469.37 and 622.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.78 : 1,469.37 = 622.76 : x
2. Step 2: Convert to fraction form
   1,064.78/1,469.37 = 622.76/x
3. Step 3: Cross multiply
   1,064.78x = 1,469.37 × 622.76
4. Step 4: Simplify right side
   1,064.78x = 915,057.51
5. Step 5: Solve for x
   x = 915,057.51/1,064.78
6. Step 6: Final answer
   x = 859.39