Finding the Fourth Proportional to 21,181.61, 29,231.39 and 12,796.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,181.61 : 29,231.39 = 12,796.49 : x
2. Step 2: Convert to fraction form
   21,181.61/29,231.39 = 12,796.49/x
3. Step 3: Cross multiply
   21,181.61x = 29,231.39 × 12,796.49
4. Step 4: Simplify right side
   21,181.61x = 374,059,075.66
5. Step 5: Solve for x
   x = 374,059,075.66/21,181.61
6. Step 6: Final answer
   x = 17,659.62