Finding the Fourth Proportional to 1,065.88, 1,470.72 and 623.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.88 : 1,470.72 = 623.76 : x
2. Step 2: Convert to fraction form
   1,065.88/1,470.72 = 623.76/x
3. Step 3: Cross multiply
   1,065.88x = 1,470.72 × 623.76
4. Step 4: Simplify right side
   1,065.88x = 917,376.31
5. Step 5: Solve for x
   x = 917,376.31/1,065.88
6. Step 6: Final answer
   x = 860.68