Finding the Fourth Proportional to 72,975.57, 109,467.69 and 20,385.06

Step by Step Solution

1. Step 1: Write the proportion equation
   72,975.57 : 109,467.69 = 20,385.06 : x
2. Step 2: Convert to fraction form
   72,975.57/109,467.69 = 20,385.06/x
3. Step 3: Cross multiply
   72,975.57x = 109,467.69 × 20,385.06
4. Step 4: Simplify right side
   72,975.57x = 2,231,505,428.71
5. Step 5: Solve for x
   x = 2,231,505,428.71/72,975.57
6. Step 6: Final answer
   x = 30,578.80