Finding the Fourth Proportional to 21,912.06, 30,253.23 and 12,962.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,912.06 : 30,253.23 = 12,962.43 : x
2. Step 2: Convert to fraction form
   21,912.06/30,253.23 = 12,962.43/x
3. Step 3: Cross multiply
   21,912.06x = 30,253.23 × 12,962.43
4. Step 4: Simplify right side
   21,912.06x = 392,155,376.15
5. Step 5: Solve for x
   x = 392,155,376.15/21,912.06
6. Step 6: Final answer
   x = 17,896.78