Finding the Fourth Proportional to 2,790.73, 4,185.98 and 842.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.73 : 4,185.98 = 842.88 : x
2. Step 2: Convert to fraction form
   2,790.73/4,185.98 = 842.88/x
3. Step 3: Cross multiply
   2,790.73x = 4,185.98 × 842.88
4. Step 4: Simplify right side
   2,790.73x = 3,528,278.82
5. Step 5: Solve for x
   x = 3,528,278.82/2,790.73
6. Step 6: Final answer
   x = 1,264.29