Finding the Fourth Proportional to 7,020.72, 9,689.04 and 3,877.20

Step by Step Solution

1. Step 1: Write the proportion equation
   7,020.72 : 9,689.04 = 3,877.20 : x
2. Step 2: Convert to fraction form
   7,020.72/9,689.04 = 3,877.20/x
3. Step 3: Cross multiply
   7,020.72x = 9,689.04 × 3,877.20
4. Step 4: Simplify right side
   7,020.72x = 37,566,345.89
5. Step 5: Solve for x
   x = 37,566,345.89/7,020.72
6. Step 6: Final answer
   x = 5,350.78