Finding the Fourth Proportional to 30,912.12, 42,653.52 and 18,162.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,912.12 : 42,653.52 = 18,162.72 : x
2. Step 2: Convert to fraction form
   30,912.12/42,653.52 = 18,162.72/x
3. Step 3: Cross multiply
   30,912.12x = 42,653.52 × 18,162.72
4. Step 4: Simplify right side
   30,912.12x = 774,703,940.77
5. Step 5: Solve for x
   x = 774,703,940.77/30,912.12
6. Step 6: Final answer
   x = 25,061.49