Finding the Fourth Proportional to 5,123.10, 7,676.15 and 3,115.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.10 : 7,676.15 = 3,115.72 : x
2. Step 2: Convert to fraction form
   5,123.10/7,676.15 = 3,115.72/x
3. Step 3: Cross multiply
   5,123.10x = 7,676.15 × 3,115.72
4. Step 4: Simplify right side
   5,123.10x = 23,916,695.70
5. Step 5: Solve for x
   x = 23,916,695.70/5,123.10
6. Step 6: Final answer
   x = 4,668.41