Finding the Fourth Proportional to 39,513.83, 59,273.98 and 13,218.80

Step by Step Solution

1. Step 1: Write the proportion equation
   39,513.83 : 59,273.98 = 13,218.80 : x
2. Step 2: Convert to fraction form
   39,513.83/59,273.98 = 13,218.80/x
3. Step 3: Cross multiply
   39,513.83x = 59,273.98 × 13,218.80
4. Step 4: Simplify right side
   39,513.83x = 783,530,557.41
5. Step 5: Solve for x
   x = 783,530,557.41/39,513.83
6. Step 6: Final answer
   x = 19,829.28