Finding the Fourth Proportional to 5,158.29, 7,118.30 and 2,920.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,158.29 : 7,118.30 = 2,920.15 : x
2. Step 2: Convert to fraction form
   5,158.29/7,118.30 = 2,920.15/x
3. Step 3: Cross multiply
   5,158.29x = 7,118.30 × 2,920.15
4. Step 4: Simplify right side
   5,158.29x = 20,786,453.55
5. Step 5: Solve for x
   x = 20,786,453.55/5,158.29
6. Step 6: Final answer
   x = 4,029.72