Finding the Fourth Proportional to 7,124.62, 9,831.96 and 3,980.81

Step by Step Solution

1. Step 1: Write the proportion equation
   7,124.62 : 9,831.96 = 3,980.81 : x
2. Step 2: Convert to fraction form
   7,124.62/9,831.96 = 3,980.81/x
3. Step 3: Cross multiply
   7,124.62x = 9,831.96 × 3,980.81
4. Step 4: Simplify right side
   7,124.62x = 39,139,144.78
5. Step 5: Solve for x
   x = 39,139,144.78/7,124.62
6. Step 6: Final answer
   x = 5,493.51