Finding the Fourth Proportional to 72,727.08, 109,071.18 and 20,139.45

Step by Step Solution

1. Step 1: Write the proportion equation
   72,727.08 : 109,071.18 = 20,139.45 : x
2. Step 2: Convert to fraction form
   72,727.08/109,071.18 = 20,139.45/x
3. Step 3: Cross multiply
   72,727.08x = 109,071.18 × 20,139.45
4. Step 4: Simplify right side
   72,727.08x = 2,196,633,576.05
5. Step 5: Solve for x
   x = 2,196,633,576.05/72,727.08
6. Step 6: Final answer
   x = 30,203.79