Finding the Fourth Proportional to 72.67, 100.71 and 71.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.67 : 100.71 = 71.31 : x
2. Step 2: Convert to fraction form
   72.67/100.71 = 71.31/x
3. Step 3: Cross multiply
   72.67x = 100.71 × 71.31
4. Step 4: Simplify right side
   72.67x = 7,181.63
5. Step 5: Solve for x
   x = 7,181.63/72.67
6. Step 6: Final answer
   x = 98.83