Finding the Fourth Proportional to 21,109.40, 29,134.56 and 12,162.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109.40 : 29,134.56 = 12,162.08 : x
2. Step 2: Convert to fraction form
   21,109.40/29,134.56 = 12,162.08/x
3. Step 3: Cross multiply
   21,109.40x = 29,134.56 × 12,162.08
4. Step 4: Simplify right side
   21,109.40x = 354,336,849.48
5. Step 5: Solve for x
   x = 354,336,849.48/21,109.40
6. Step 6: Final answer
   x = 16,785.74