Finding the Fourth Proportional to 7,021.30, 9,689.39 and 3,877.49

Step by Step Solution

1. Step 1: Write the proportion equation
   7,021.30 : 9,689.39 = 3,877.49 : x
2. Step 2: Convert to fraction form
   7,021.30/9,689.39 = 3,877.49/x
3. Step 3: Cross multiply
   7,021.30x = 9,689.39 × 3,877.49
4. Step 4: Simplify right side
   7,021.30x = 37,570,512.83
5. Step 5: Solve for x
   x = 37,570,512.83/7,021.30
6. Step 6: Final answer
   x = 5,350.93