Finding the Fourth Proportional to 72.67, 100.20 and 49.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.67 : 100.20 = 49.31 : x
2. Step 2: Convert to fraction form
   72.67/100.20 = 49.31/x
3. Step 3: Cross multiply
   72.67x = 100.20 × 49.31
4. Step 4: Simplify right side
   72.67x = 4,940.62
5. Step 5: Solve for x
   x = 4,940.62/72.67
6. Step 6: Final answer
   x = 67.99