Finding the Fourth Proportional to 21,146.12, 29,181.56 and 12,193.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,146.12 : 29,181.56 = 12,193.59 : x
2. Step 2: Convert to fraction form
   21,146.12/29,181.56 = 12,193.59/x
3. Step 3: Cross multiply
   21,146.12x = 29,181.56 × 12,193.59
4. Step 4: Simplify right side
   21,146.12x = 355,827,978.20
5. Step 5: Solve for x
   x = 355,827,978.20/21,146.12
6. Step 6: Final answer
   x = 16,827.10