Finding the Fourth Proportional to 2,808.78, 3,875.49 and 1,813.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,808.78 : 3,875.49 = 1,813.91 : x
2. Step 2: Convert to fraction form
   2,808.78/3,875.49 = 1,813.91/x
3. Step 3: Cross multiply
   2,808.78x = 3,875.49 × 1,813.91
4. Step 4: Simplify right side
   2,808.78x = 7,029,770.69
5. Step 5: Solve for x
   x = 7,029,770.69/2,808.78
6. Step 6: Final answer
   x = 2,502.78