Finding the Fourth Proportional to 2,788.92, 3,815.69 and 2,777.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,788.92 : 3,815.69 = 2,777.31 : x
2. Step 2: Convert to fraction form
   2,788.92/3,815.69 = 2,777.31/x
3. Step 3: Cross multiply
   2,788.92x = 3,815.69 × 2,777.31
4. Step 4: Simplify right side
   2,788.92x = 10,597,340.11
5. Step 5: Solve for x
   x = 10,597,340.11/2,788.92
6. Step 6: Final answer
   x = 3,799.80