Finding the Fourth Proportional to 2,818.56, 3,892.80 and 2,380.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.56 : 3,892.80 = 2,380.16 : x
2. Step 2: Convert to fraction form
   2,818.56/3,892.80 = 2,380.16/x
3. Step 3: Cross multiply
   2,818.56x = 3,892.80 × 2,380.16
4. Step 4: Simplify right side
   2,818.56x = 9,265,486.85
5. Step 5: Solve for x
   x = 9,265,486.85/2,818.56
6. Step 6: Final answer
   x = 3,287.31