Finding the Fourth Proportional to 21,715.90, 29,926.98 and 17,404.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,715.90 : 29,926.98 = 17,404.09 : x
2. Step 2: Convert to fraction form
   21,715.90/29,926.98 = 17,404.09/x
3. Step 3: Cross multiply
   21,715.90x = 29,926.98 × 17,404.09
4. Step 4: Simplify right side
   21,715.90x = 520,851,853.35
5. Step 5: Solve for x
   x = 520,851,853.35/21,715.90
6. Step 6: Final answer
   x = 23,984.82