Finding the Fourth Proportional to 99.57, 149.49 and 72.57

Step by Step Solution

1. Step 1: Write the proportion equation
   99.57 : 149.49 = 72.57 : x
2. Step 2: Convert to fraction form
   99.57/149.49 = 72.57/x
3. Step 3: Cross multiply
   99.57x = 149.49 × 72.57
4. Step 4: Simplify right side
   99.57x = 10,848.49
5. Step 5: Solve for x
   x = 10,848.49/99.57
6. Step 6: Final answer
   x = 108.95