Finding the Fourth Proportional to 72,723.29, 109,087.34 and 20,128.37

Step by Step Solution

1. Step 1: Write the proportion equation
   72,723.29 : 109,087.34 = 20,128.37 : x
2. Step 2: Convert to fraction form
   72,723.29/109,087.34 = 20,128.37/x
3. Step 3: Cross multiply
   72,723.29x = 109,087.34 × 20,128.37
4. Step 4: Simplify right side
   72,723.29x = 2,195,749,695.76
5. Step 5: Solve for x
   x = 2,195,749,695.76/72,723.29
6. Step 6: Final answer
   x = 30,193.21