Finding the Fourth Proportional to 39,105.69, 58,658.51 and 14,139.89

Step by Step Solution

1. Step 1: Write the proportion equation
   39,105.69 : 58,658.51 = 14,139.89 : x
2. Step 2: Convert to fraction form
   39,105.69/58,658.51 = 14,139.89/x
3. Step 3: Cross multiply
   39,105.69x = 58,658.51 × 14,139.89
4. Step 4: Simplify right side
   39,105.69x = 829,424,514.97
5. Step 5: Solve for x
   x = 829,424,514.97/39,105.69
6. Step 6: Final answer
   x = 21,209.82