Finding the Fourth Proportional to 3,820.83, 5,728.17 and 2,178.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,820.83 : 5,728.17 = 2,178.15 : x
2. Step 2: Convert to fraction form
   3,820.83/5,728.17 = 2,178.15/x
3. Step 3: Cross multiply
   3,820.83x = 5,728.17 × 2,178.15
4. Step 4: Simplify right side
   3,820.83x = 12,476,813.49
5. Step 5: Solve for x
   x = 12,476,813.49/3,820.83
6. Step 6: Final answer
   x = 3,265.47