Finding the Fourth Proportional to 72,672.32, 109,008.42 and 20,081.79

Step by Step Solution

1. Step 1: Write the proportion equation
   72,672.32 : 109,008.42 = 20,081.79 : x
2. Step 2: Convert to fraction form
   72,672.32/109,008.42 = 20,081.79/x
3. Step 3: Cross multiply
   72,672.32x = 109,008.42 × 20,081.79
4. Step 4: Simplify right side
   72,672.32x = 2,189,084,123.37
5. Step 5: Solve for x
   x = 2,189,084,123.37/72,672.32
6. Step 6: Final answer
   x = 30,122.67