Finding the Fourth Proportional to 72,972.56, 109,463.18 and 20,382.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,972.56 : 109,463.18 = 20,382.05 : x
2. Step 2: Convert to fraction form
   72,972.56/109,463.18 = 20,382.05/x
3. Step 3: Cross multiply
   72,972.56x = 109,463.18 × 20,382.05
4. Step 4: Simplify right side
   72,972.56x = 2,231,084,179.67
5. Step 5: Solve for x
   x = 2,231,084,179.67/72,972.56
6. Step 6: Final answer
   x = 30,574.29