Finding the Fourth Proportional to 72,747.52, 109,128.87 and 20,157.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,747.52 : 109,128.87 = 20,157.05 : x
2. Step 2: Convert to fraction form
   72,747.52/109,128.87 = 20,157.05/x
3. Step 3: Cross multiply
   72,747.52x = 109,128.87 × 20,157.05
4. Step 4: Simplify right side
   72,747.52x = 2,199,716,361.86
5. Step 5: Solve for x
   x = 2,199,716,361.86/72,747.52
6. Step 6: Final answer
   x = 30,237.68