Finding the Fourth Proportional to 39,786.18, 59,686.38 and 16,399.86

Step by Step Solution

1. Step 1: Write the proportion equation
   39,786.18 : 59,686.38 = 16,399.86 : x
2. Step 2: Convert to fraction form
   39,786.18/59,686.38 = 16,399.86/x
3. Step 3: Cross multiply
   39,786.18x = 59,686.38 × 16,399.86
4. Step 4: Simplify right side
   39,786.18x = 978,848,275.91
5. Step 5: Solve for x
   x = 978,848,275.91/39,786.18
6. Step 6: Final answer
   x = 24,602.72