Finding the Fourth Proportional to 1,065.48, 1,469.79 and 623.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.48 : 1,469.79 = 623.31 : x
2. Step 2: Convert to fraction form
   1,065.48/1,469.79 = 623.31/x
3. Step 3: Cross multiply
   1,065.48x = 1,469.79 × 623.31
4. Step 4: Simplify right side
   1,065.48x = 916,134.80
5. Step 5: Solve for x
   x = 916,134.80/1,065.48
6. Step 6: Final answer
   x = 859.83