Finding the Fourth Proportional to 72,729.71, 109,094.38 and 20,139.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72,729.71 : 109,094.38 = 20,139.02 : x
2. Step 2: Convert to fraction form
   72,729.71/109,094.38 = 20,139.02/x
3. Step 3: Cross multiply
   72,729.71x = 109,094.38 × 20,139.02
4. Step 4: Simplify right side
   72,729.71x = 2,197,053,900.71
5. Step 5: Solve for x
   x = 2,197,053,900.71/72,729.71
6. Step 6: Final answer
   x = 30,208.48