Finding the Fourth Proportional to 5,155.83, 7,728.39 and 3,920.67

Step by Step Solution

1. Step 1: Write the proportion equation
   5,155.83 : 7,728.39 = 3,920.67 : x
2. Step 2: Convert to fraction form
   5,155.83/7,728.39 = 3,920.67/x
3. Step 3: Cross multiply
   5,155.83x = 7,728.39 × 3,920.67
4. Step 4: Simplify right side
   5,155.83x = 30,300,466.82
5. Step 5: Solve for x
   x = 30,300,466.82/5,155.83
6. Step 6: Final answer
   x = 5,876.93