Finding the Fourth Proportional to 5,158.05, 7,118.31 and 2,920.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,158.05 : 7,118.31 = 2,920.20 : x
2. Step 2: Convert to fraction form
   5,158.05/7,118.31 = 2,920.20/x
3. Step 3: Cross multiply
   5,158.05x = 7,118.31 × 2,920.20
4. Step 4: Simplify right side
   5,158.05x = 20,786,888.86
5. Step 5: Solve for x
   x = 20,786,888.86/5,158.05
6. Step 6: Final answer
   x = 4,029.99