Finding the Fourth Proportional to 22,411.92, 30,928.32 and 12,980.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,411.92 : 30,928.32 = 12,980.28 : x
2. Step 2: Convert to fraction form
   22,411.92/30,928.32 = 12,980.28/x
3. Step 3: Cross multiply
   22,411.92x = 30,928.32 × 12,980.28
4. Step 4: Simplify right side
   22,411.92x = 401,458,253.53
5. Step 5: Solve for x
   x = 401,458,253.53/22,411.92
6. Step 6: Final answer
   x = 17,912.71