Finding the Fourth Proportional to 5,103.78, 7,043.72 and 3,115.67

Step by Step Solution

1. Step 1: Write the proportion equation
   5,103.78 : 7,043.72 = 3,115.67 : x
2. Step 2: Convert to fraction form
   5,103.78/7,043.72 = 3,115.67/x
3. Step 3: Cross multiply
   5,103.78x = 7,043.72 × 3,115.67
4. Step 4: Simplify right side
   5,103.78x = 21,945,856.30
5. Step 5: Solve for x
   x = 21,945,856.30/5,103.78
6. Step 6: Final answer
   x = 4,299.92