Finding the Fourth Proportional to 21,095.83, 29,112.31 and 12,143.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,095.83 : 29,112.31 = 12,143.17 : x
2. Step 2: Convert to fraction form
   21,095.83/29,112.31 = 12,143.17/x
3. Step 3: Cross multiply
   21,095.83x = 29,112.31 × 12,143.17
4. Step 4: Simplify right side
   21,095.83x = 353,515,729.42
5. Step 5: Solve for x
   x = 353,515,729.42/21,095.83
6. Step 6: Final answer
   x = 16,757.61