Finding the Fourth Proportional to 3,957.78, 5,461.58 and 2,279.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,957.78 : 5,461.58 = 2,279.25 : x
2. Step 2: Convert to fraction form
   3,957.78/5,461.58 = 2,279.25/x
3. Step 3: Cross multiply
   3,957.78x = 5,461.58 × 2,279.25
4. Step 4: Simplify right side
   3,957.78x = 12,448,294.82
5. Step 5: Solve for x
   x = 12,448,294.82/3,957.78
6. Step 6: Final answer
   x = 3,145.27