Finding the Fourth Proportional to 2,766.16, 3,815.20 and 2,019.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,766.16 : 3,815.20 = 2,019.88 : x
2. Step 2: Convert to fraction form
   2,766.16/3,815.20 = 2,019.88/x
3. Step 3: Cross multiply
   2,766.16x = 3,815.20 × 2,019.88
4. Step 4: Simplify right side
   2,766.16x = 7,706,246.18
5. Step 5: Solve for x
   x = 7,706,246.18/2,766.16
6. Step 6: Final answer
   x = 2,785.90