Finding the Fourth Proportional to 1,272.73, 1,906.79 and 579.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.73 : 1,906.79 = 579.98 : x
2. Step 2: Convert to fraction form
   1,272.73/1,906.79 = 579.98/x
3. Step 3: Cross multiply
   1,272.73x = 1,906.79 × 579.98
4. Step 4: Simplify right side
   1,272.73x = 1,105,904.52
5. Step 5: Solve for x
   x = 1,105,904.52/1,272.73
6. Step 6: Final answer
   x = 868.92