Finding the Fourth Proportional to 21,008.34, 31,326.71 and 19,578.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,008.34 : 31,326.71 = 19,578.42 : x
2. Step 2: Convert to fraction form
   21,008.34/31,326.71 = 19,578.42/x
3. Step 3: Cross multiply
   21,008.34x = 31,326.71 × 19,578.42
4. Step 4: Simplify right side
   21,008.34x = 613,327,387.71
5. Step 5: Solve for x
   x = 613,327,387.71/21,008.34
6. Step 6: Final answer
   x = 29,194.47