Finding the Fourth Proportional to 21,892.55, 30,212.39 and 12,459.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,892.55 : 30,212.39 = 12,459.29 : x
2. Step 2: Convert to fraction form
   21,892.55/30,212.39 = 12,459.29/x
3. Step 3: Cross multiply
   21,892.55x = 30,212.39 × 12,459.29
4. Step 4: Simplify right side
   21,892.55x = 376,424,808.69
5. Step 5: Solve for x
   x = 376,424,808.69/21,892.55
6. Step 6: Final answer
   x = 17,194.20