Finding the Fourth Proportional to 2,308.20, 3,118.50 and 2,308.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,308.20 : 3,118.50 = 2,308.20 : x
2. Step 2: Convert to fraction form
   2,308.20/3,118.50 = 2,308.20/x
3. Step 3: Cross multiply
   2,308.20x = 3,118.50 × 2,308.20
4. Step 4: Simplify right side
   2,308.20x = 7,198,121.70
5. Step 5: Solve for x
   x = 7,198,121.70/2,308.20
6. Step 6: Final answer
   x = 3,118.50