Finding the Fourth Proportional to 21,758.18, 30,029.01 and 12,329.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,758.18 : 30,029.01 = 12,329.78 : x
2. Step 2: Convert to fraction form
   21,758.18/30,029.01 = 12,329.78/x
3. Step 3: Cross multiply
   21,758.18x = 30,029.01 × 12,329.78
4. Step 4: Simplify right side
   21,758.18x = 370,251,086.92
5. Step 5: Solve for x
   x = 370,251,086.92/21,758.18
6. Step 6: Final answer
   x = 17,016.64