Finding the Fourth Proportional to 1,362.23, 1,879.89 and 772.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.23 : 1,879.89 = 772.76 : x
2. Step 2: Convert to fraction form
   1,362.23/1,879.89 = 772.76/x
3. Step 3: Cross multiply
   1,362.23x = 1,879.89 × 772.76
4. Step 4: Simplify right side
   1,362.23x = 1,452,694.40
5. Step 5: Solve for x
   x = 1,452,694.40/1,362.23
6. Step 6: Final answer
   x = 1,066.41