Finding the Fourth Proportional to 1,218.56, 1,826.72 and 448.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218.56 : 1,826.72 = 448.80 : x
2. Step 2: Convert to fraction form
   1,218.56/1,826.72 = 448.80/x
3. Step 3: Cross multiply
   1,218.56x = 1,826.72 × 448.80
4. Step 4: Simplify right side
   1,218.56x = 819,831.94
5. Step 5: Solve for x
   x = 819,831.94/1,218.56
6. Step 6: Final answer
   x = 672.79