Finding the Fourth Proportional to 20,510.42, 30,823.34 and 12,191.92

Step by Step Solution

1. Step 1: Write the proportion equation
   20,510.42 : 30,823.34 = 12,191.92 : x
2. Step 2: Convert to fraction form
   20,510.42/30,823.34 = 12,191.92/x
3. Step 3: Cross multiply
   20,510.42x = 30,823.34 × 12,191.92
4. Step 4: Simplify right side
   20,510.42x = 375,795,557.39
5. Step 5: Solve for x
   x = 375,795,557.39/20,510.42
6. Step 6: Final answer
   x = 18,322.18