Finding the Fourth Proportional to 21,086.00, 29,103.53 and 12,138.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.00 : 29,103.53 = 12,138.69 : x
2. Step 2: Convert to fraction form
   21,086.00/29,103.53 = 12,138.69/x
3. Step 3: Cross multiply
   21,086.00x = 29,103.53 × 12,138.69
4. Step 4: Simplify right side
   21,086.00x = 353,278,667.88
5. Step 5: Solve for x
   x = 353,278,667.88/21,086.00
6. Step 6: Final answer
   x = 16,754.19