Finding the Fourth Proportional to 1,065.60, 1,470.59 and 623.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.60 : 1,470.59 = 623.76 : x
2. Step 2: Convert to fraction form
   1,065.60/1,470.59 = 623.76/x
3. Step 3: Cross multiply
   1,065.60x = 1,470.59 × 623.76
4. Step 4: Simplify right side
   1,065.60x = 917,292.10
5. Step 5: Solve for x
   x = 917,292.10/1,065.60
6. Step 6: Final answer
   x = 860.82