Finding the Fourth Proportional to 42,711.72, 64,081.29 and 20,526.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42,711.72 : 64,081.29 = 20,526.71 : x
2. Step 2: Convert to fraction form
   42,711.72/64,081.29 = 20,526.71/x
3. Step 3: Cross multiply
   42,711.72x = 64,081.29 × 20,526.71
4. Step 4: Simplify right side
   42,711.72x = 1,315,377,735.85
5. Step 5: Solve for x
   x = 1,315,377,735.85/42,711.72
6. Step 6: Final answer
   x = 30,796.65