Finding the Fourth Proportional to 3,978.78, 5,958.45 and 2,742.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.78 : 5,958.45 = 2,742.72 : x
2. Step 2: Convert to fraction form
   3,978.78/5,958.45 = 2,742.72/x
3. Step 3: Cross multiply
   3,978.78x = 5,958.45 × 2,742.72
4. Step 4: Simplify right side
   3,978.78x = 16,342,359.98
5. Step 5: Solve for x
   x = 16,342,359.98/3,978.78
6. Step 6: Final answer
   x = 4,107.38