Finding the Fourth Proportional to 2,978.08, 4,105.48 and 2,091.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.08 : 4,105.48 = 2,091.20 : x
2. Step 2: Convert to fraction form
   2,978.08/4,105.48 = 2,091.20/x
3. Step 3: Cross multiply
   2,978.08x = 4,105.48 × 2,091.20
4. Step 4: Simplify right side
   2,978.08x = 8,585,379.78
5. Step 5: Solve for x
   x = 8,585,379.78/2,978.08
6. Step 6: Final answer
   x = 2,882.86