Finding the Fourth Proportional to 2,815.98, 3,883.77 and 2,151.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.98 : 3,883.77 = 2,151.78 : x
2. Step 2: Convert to fraction form
   2,815.98/3,883.77 = 2,151.78/x
3. Step 3: Cross multiply
   2,815.98x = 3,883.77 × 2,151.78
4. Step 4: Simplify right side
   2,815.98x = 8,357,018.61
5. Step 5: Solve for x
   x = 8,357,018.61/2,815.98
6. Step 6: Final answer
   x = 2,967.71