Finding the Fourth Proportional to 10,906.80, 16,362.36 and 3,981.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,906.80 : 16,362.36 = 3,981.12 : x
2. Step 2: Convert to fraction form
   10,906.80/16,362.36 = 3,981.12/x
3. Step 3: Cross multiply
   10,906.80x = 16,362.36 × 3,981.12
4. Step 4: Simplify right side
   10,906.80x = 65,140,518.64
5. Step 5: Solve for x
   x = 65,140,518.64/10,906.80
6. Step 6: Final answer
   x = 5,972.47