Finding the Fourth Proportional to 1,065.72, 1,470.57 and 623.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.72 : 1,470.57 = 623.61 : x
2. Step 2: Convert to fraction form
   1,065.72/1,470.57 = 623.61/x
3. Step 3: Cross multiply
   1,065.72x = 1,470.57 × 623.61
4. Step 4: Simplify right side
   1,065.72x = 917,062.16
5. Step 5: Solve for x
   x = 917,062.16/1,065.72
6. Step 6: Final answer
   x = 860.51