Finding the Fourth Proportional to 21,646.29, 29,878.69 and 12,697.41

Step by Step Solution

1. Step 1: Write the proportion equation
   21,646.29 : 29,878.69 = 12,697.41 : x
2. Step 2: Convert to fraction form
   21,646.29/29,878.69 = 12,697.41/x
3. Step 3: Cross multiply
   21,646.29x = 29,878.69 × 12,697.41
4. Step 4: Simplify right side
   21,646.29x = 379,382,081.30
5. Step 5: Solve for x
   x = 379,382,081.30/21,646.29
6. Step 6: Final answer
   x = 17,526.42