Finding the Fourth Proportional to 21,617.38, 29,832.06 and 12,186.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,617.38 : 29,832.06 = 12,186.10 : x
2. Step 2: Convert to fraction form
   21,617.38/29,832.06 = 12,186.10/x
3. Step 3: Cross multiply
   21,617.38x = 29,832.06 × 12,186.10
4. Step 4: Simplify right side
   21,617.38x = 363,536,466.37
5. Step 5: Solve for x
   x = 363,536,466.37/21,617.38
6. Step 6: Final answer
   x = 16,816.86