Finding the Fourth Proportional to 72.99, 99.72 and 72.54

Step by Step Solution

1. Step 1: Write the proportion equation
   72.99 : 99.72 = 72.54 : x
2. Step 2: Convert to fraction form
   72.99/99.72 = 72.54/x
3. Step 3: Cross multiply
   72.99x = 99.72 × 72.54
4. Step 4: Simplify right side
   72.99x = 7,233.69
5. Step 5: Solve for x
   x = 7,233.69/72.99
6. Step 6: Final answer
   x = 99.11