Finding the Fourth Proportional to 1,362.18, 1,879.46 and 772.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.18 : 1,879.46 = 772.50 : x
2. Step 2: Convert to fraction form
   1,362.18/1,879.46 = 772.50/x
3. Step 3: Cross multiply
   1,362.18x = 1,879.46 × 772.50
4. Step 4: Simplify right side
   1,362.18x = 1,451,882.85
5. Step 5: Solve for x
   x = 1,451,882.85/1,362.18
6. Step 6: Final answer
   x = 1,065.85