Finding the Fourth Proportional to 7,978.20, 11,965.47 and 2,354.42

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.20 : 11,965.47 = 2,354.42 : x
2. Step 2: Convert to fraction form
   7,978.20/11,965.47 = 2,354.42/x
3. Step 3: Cross multiply
   7,978.20x = 11,965.47 × 2,354.42
4. Step 4: Simplify right side
   7,978.20x = 28,171,741.88
5. Step 5: Solve for x
   x = 28,171,741.88/7,978.20
6. Step 6: Final answer
   x = 3,531.09