Finding the Fourth Proportional to 3,116.43, 4,308.90 and 2,978.73

Step by Step Solution

1. Step 1: Write the proportion equation
   3,116.43 : 4,308.90 = 2,978.73 : x
2. Step 2: Convert to fraction form
   3,116.43/4,308.90 = 2,978.73/x
3. Step 3: Cross multiply
   3,116.43x = 4,308.90 × 2,978.73
4. Step 4: Simplify right side
   3,116.43x = 12,835,049.70
5. Step 5: Solve for x
   x = 12,835,049.70/3,116.43
6. Step 6: Final answer
   x = 4,118.51