Finding the Fourth Proportional to 72,663.72, 108,987.36 and 20,080.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72,663.72 : 108,987.36 = 20,080.68 : x
2. Step 2: Convert to fraction form
   72,663.72/108,987.36 = 20,080.68/x
3. Step 3: Cross multiply
   72,663.72x = 108,987.36 × 20,080.68
4. Step 4: Simplify right side
   72,663.72x = 2,188,540,300.20
5. Step 5: Solve for x
   x = 2,188,540,300.20/72,663.72
6. Step 6: Final answer
   x = 30,118.75