Finding the Fourth Proportional to 3,843.80, 5,300.89 and 2,851.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,843.80 : 5,300.89 = 2,851.55 : x
2. Step 2: Convert to fraction form
   3,843.80/5,300.89 = 2,851.55/x
3. Step 3: Cross multiply
   3,843.80x = 5,300.89 × 2,851.55
4. Step 4: Simplify right side
   3,843.80x = 15,115,752.88
5. Step 5: Solve for x
   x = 15,115,752.88/3,843.80
6. Step 6: Final answer
   x = 3,932.50