Finding the Fourth Proportional to 72,921.42, 109,388.32 and 20,330.96

Step by Step Solution

1. Step 1: Write the proportion equation
   72,921.42 : 109,388.32 = 20,330.96 : x
2. Step 2: Convert to fraction form
   72,921.42/109,388.32 = 20,330.96/x
3. Step 3: Cross multiply
   72,921.42x = 109,388.32 × 20,330.96
4. Step 4: Simplify right side
   72,921.42x = 2,223,969,558.39
5. Step 5: Solve for x
   x = 2,223,969,558.39/72,921.42
6. Step 6: Final answer
   x = 30,498.17