Finding the Fourth Proportional to 72.74, 100.15 and 72.48

Step by Step Solution

1. Step 1: Write the proportion equation
   72.74 : 100.15 = 72.48 : x
2. Step 2: Convert to fraction form
   72.74/100.15 = 72.48/x
3. Step 3: Cross multiply
   72.74x = 100.15 × 72.48
4. Step 4: Simplify right side
   72.74x = 7,258.87
5. Step 5: Solve for x
   x = 7,258.87/72.74
6. Step 6: Final answer
   x = 99.79