Finding the Fourth Proportional to 21,806.28, 30,099.48 and 12,381.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,806.28 : 30,099.48 = 12,381.12 : x
2. Step 2: Convert to fraction form
   21,806.28/30,099.48 = 12,381.12/x
3. Step 3: Cross multiply
   21,806.28x = 30,099.48 × 12,381.12
4. Step 4: Simplify right side
   21,806.28x = 372,665,273.82
5. Step 5: Solve for x
   x = 372,665,273.82/21,806.28
6. Step 6: Final answer
   x = 17,089.81