Finding the Fourth Proportional to 3,947.34, 5,449.06 and 2,772.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947.34 : 5,449.06 = 2,772.78 : x
2. Step 2: Convert to fraction form
   3,947.34/5,449.06 = 2,772.78/x
3. Step 3: Cross multiply
   3,947.34x = 5,449.06 × 2,772.78
4. Step 4: Simplify right side
   3,947.34x = 15,109,044.59
5. Step 5: Solve for x
   x = 15,109,044.59/3,947.34
6. Step 6: Final answer
   x = 3,827.65