Finding the Fourth Proportional to 72.48, 100.72 and 71.62

Step by Step Solution

1. Step 1: Write the proportion equation
   72.48 : 100.72 = 71.62 : x
2. Step 2: Convert to fraction form
   72.48/100.72 = 71.62/x
3. Step 3: Cross multiply
   72.48x = 100.72 × 71.62
4. Step 4: Simplify right side
   72.48x = 7,213.57
5. Step 5: Solve for x
   x = 7,213.57/72.48
6. Step 6: Final answer
   x = 99.52