Finding the Fourth Proportional to 72,787.78, 109,181.72 and 20,197.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72,787.78 : 109,181.72 = 20,197.32 : x
2. Step 2: Convert to fraction form
   72,787.78/109,181.72 = 20,197.32/x
3. Step 3: Cross multiply
   72,787.78x = 109,181.72 × 20,197.32
4. Step 4: Simplify right side
   72,787.78x = 2,205,177,778.05
5. Step 5: Solve for x
   x = 2,205,177,778.05/72,787.78
6. Step 6: Final answer
   x = 30,295.99