Finding the Fourth Proportional to 71,145.72, 106,738.20 and 21,227.49

Step by Step Solution

1. Step 1: Write the proportion equation
   71,145.72 : 106,738.20 = 21,227.49 : x
2. Step 2: Convert to fraction form
   71,145.72/106,738.20 = 21,227.49/x
3. Step 3: Cross multiply
   71,145.72x = 106,738.20 × 21,227.49
4. Step 4: Simplify right side
   71,145.72x = 2,265,784,073.12
5. Step 5: Solve for x
   x = 2,265,784,073.12/71,145.72
6. Step 6: Final answer
   x = 31,847.09