Finding the Fourth Proportional to 2,978.26, 4,105.21 and 2,020.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.26 : 4,105.21 = 2,020.86 : x
2. Step 2: Convert to fraction form
   2,978.26/4,105.21 = 2,020.86/x
3. Step 3: Cross multiply
   2,978.26x = 4,105.21 × 2,020.86
4. Step 4: Simplify right side
   2,978.26x = 8,296,054.68
5. Step 5: Solve for x
   x = 8,296,054.68/2,978.26
6. Step 6: Final answer
   x = 2,785.54