Finding the Fourth Proportional to 21,332.27, 29,431.27 and 12,947.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,332.27 : 29,431.27 = 12,947.15 : x
2. Step 2: Convert to fraction form
   21,332.27/29,431.27 = 12,947.15/x
3. Step 3: Cross multiply
   21,332.27x = 29,431.27 × 12,947.15
4. Step 4: Simplify right side
   21,332.27x = 381,051,067.38
5. Step 5: Solve for x
   x = 381,051,067.38/21,332.27
6. Step 6: Final answer
   x = 17,862.66