Finding the Fourth Proportional to 19,401.91, 29,139.77 and 12,057.69

Step by Step Solution

1. Step 1: Write the proportion equation
   19,401.91 : 29,139.77 = 12,057.69 : x
2. Step 2: Convert to fraction form
   19,401.91/29,139.77 = 12,057.69/x
3. Step 3: Cross multiply
   19,401.91x = 29,139.77 × 12,057.69
4. Step 4: Simplify right side
   19,401.91x = 351,358,313.33
5. Step 5: Solve for x
   x = 351,358,313.33/19,401.91
6. Step 6: Final answer
   x = 18,109.47