Finding the Fourth Proportional to 21,721.31, 29,959.94 and 19,934.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,721.31 : 29,959.94 = 19,934.56 : x
2. Step 2: Convert to fraction form
   21,721.31/29,959.94 = 19,934.56/x
3. Step 3: Cross multiply
   21,721.31x = 29,959.94 × 19,934.56
4. Step 4: Simplify right side
   21,721.31x = 597,238,196.46
5. Step 5: Solve for x
   x = 597,238,196.46/21,721.31
6. Step 6: Final answer
   x = 27,495.50