Finding the Fourth Proportional to 99.36, 149.18 and 72.46

Step by Step Solution

1. Step 1: Write the proportion equation
   99.36 : 149.18 = 72.46 : x
2. Step 2: Convert to fraction form
   99.36/149.18 = 72.46/x
3. Step 3: Cross multiply
   99.36x = 149.18 × 72.46
4. Step 4: Simplify right side
   99.36x = 10,809.58
5. Step 5: Solve for x
   x = 10,809.58/99.36
6. Step 6: Final answer
   x = 108.79