Finding the Fourth Proportional to 1,065.89, 1,470.96 and 623.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.89 : 1,470.96 = 623.80 : x
2. Step 2: Convert to fraction form
   1,065.89/1,470.96 = 623.80/x
3. Step 3: Cross multiply
   1,065.89x = 1,470.96 × 623.80
4. Step 4: Simplify right side
   1,065.89x = 917,586.69
5. Step 5: Solve for x
   x = 917,586.69/1,065.89
6. Step 6: Final answer
   x = 860.86