Finding the Fourth Proportional to 3,978.62, 5,965.88 and 2,105.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.62 : 5,965.88 = 2,105.52 : x
2. Step 2: Convert to fraction form
   3,978.62/5,965.88 = 2,105.52/x
3. Step 3: Cross multiply
   3,978.62x = 5,965.88 × 2,105.52
4. Step 4: Simplify right side
   3,978.62x = 12,561,279.66
5. Step 5: Solve for x
   x = 12,561,279.66/3,978.62
6. Step 6: Final answer
   x = 3,157.20