Finding the Fourth Proportional to 1,065.86, 1,470.82 and 623.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.86 : 1,470.82 = 623.74 : x
2. Step 2: Convert to fraction form
   1,065.86/1,470.82 = 623.74/x
3. Step 3: Cross multiply
   1,065.86x = 1,470.82 × 623.74
4. Step 4: Simplify right side
   1,065.86x = 917,409.27
5. Step 5: Solve for x
   x = 917,409.27/1,065.86
6. Step 6: Final answer
   x = 860.72