Finding the Fourth Proportional to 21,139.72, 29,106.40 and 17,946.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,139.72 : 29,106.40 = 17,946.38 : x
2. Step 2: Convert to fraction form
   21,139.72/29,106.40 = 17,946.38/x
3. Step 3: Cross multiply
   21,139.72x = 29,106.40 × 17,946.38
4. Step 4: Simplify right side
   21,139.72x = 522,354,514.83
5. Step 5: Solve for x
   x = 522,354,514.83/21,139.72
6. Step 6: Final answer
   x = 24,709.62