Finding the Fourth Proportional to 3,906.12, 5,854.08 and 2,978.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.12 : 5,854.08 = 2,978.28 : x
2. Step 2: Convert to fraction form
   3,906.12/5,854.08 = 2,978.28/x
3. Step 3: Cross multiply
   3,906.12x = 5,854.08 × 2,978.28
4. Step 4: Simplify right side
   3,906.12x = 17,435,089.38
5. Step 5: Solve for x
   x = 17,435,089.38/3,906.12
6. Step 6: Final answer
   x = 4,463.53