Finding the Fourth Proportional to 72,921.48, 109,382.72 and 20,331.42

Step by Step Solution

1. Step 1: Write the proportion equation
   72,921.48 : 109,382.72 = 20,331.42 : x
2. Step 2: Convert to fraction form
   72,921.48/109,382.72 = 20,331.42/x
3. Step 3: Cross multiply
   72,921.48x = 109,382.72 × 20,331.42
4. Step 4: Simplify right side
   72,921.48x = 2,223,905,919.41
5. Step 5: Solve for x
   x = 2,223,905,919.41/72,921.48
6. Step 6: Final answer
   x = 30,497.27