Finding the Fourth Proportional to 39,760.57, 59,649.63 and 13,105.48

Step by Step Solution

1. Step 1: Write the proportion equation
   39,760.57 : 59,649.63 = 13,105.48 : x
2. Step 2: Convert to fraction form
   39,760.57/59,649.63 = 13,105.48/x
3. Step 3: Cross multiply
   39,760.57x = 59,649.63 × 13,105.48
4. Step 4: Simplify right side
   39,760.57x = 781,737,216.62
5. Step 5: Solve for x
   x = 781,737,216.62/39,760.57
6. Step 6: Final answer
   x = 19,661.12