Finding the Fourth Proportional to 7,150.92, 9,868.15 and 3,920.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,150.92 : 9,868.15 = 3,920.72 : x
2. Step 2: Convert to fraction form
   7,150.92/9,868.15 = 3,920.72/x
3. Step 3: Cross multiply
   7,150.92x = 9,868.15 × 3,920.72
4. Step 4: Simplify right side
   7,150.92x = 38,690,253.07
5. Step 5: Solve for x
   x = 38,690,253.07/7,150.92
6. Step 6: Final answer
   x = 5,410.53