Finding the Fourth Proportional to 72.49, 100.05 and 50.71

Step by Step Solution

1. Step 1: Write the proportion equation
   72.49 : 100.05 = 50.71 : x
2. Step 2: Convert to fraction form
   72.49/100.05 = 50.71/x
3. Step 3: Cross multiply
   72.49x = 100.05 × 50.71
4. Step 4: Simplify right side
   72.49x = 5,073.54
5. Step 5: Solve for x
   x = 5,073.54/72.49
6. Step 6: Final answer
   x = 69.99