Finding the Fourth Proportional to 21,114.39, 31,667.27 and 12,342.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,114.39 : 31,667.27 = 12,342.63 : x
2. Step 2: Convert to fraction form
   21,114.39/31,667.27 = 12,342.63/x
3. Step 3: Cross multiply
   21,114.39x = 31,667.27 × 12,342.63
4. Step 4: Simplify right side
   21,114.39x = 390,857,335.01
5. Step 5: Solve for x
   x = 390,857,335.01/21,114.39
6. Step 6: Final answer
   x = 18,511.42