Finding the Fourth Proportional to 39,990.26, 59,979.25 and 13,336.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,990.26 : 59,979.25 = 13,336.72 : x
2. Step 2: Convert to fraction form
   39,990.26/59,979.25 = 13,336.72/x
3. Step 3: Cross multiply
   39,990.26x = 59,979.25 × 13,336.72
4. Step 4: Simplify right side
   39,990.26x = 799,926,279.77
5. Step 5: Solve for x
   x = 799,926,279.77/39,990.26
6. Step 6: Final answer
   x = 20,003.03