Finding the Fourth Proportional to 21,881.40, 30,196.45 and 12,449.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,881.40 : 30,196.45 = 12,449.96 : x
2. Step 2: Convert to fraction form
   21,881.40/30,196.45 = 12,449.96/x
3. Step 3: Cross multiply
   21,881.40x = 30,196.45 × 12,449.96
4. Step 4: Simplify right side
   21,881.40x = 375,944,572.46
5. Step 5: Solve for x
   x = 375,944,572.46/21,881.40
6. Step 6: Final answer
   x = 17,181.01