Finding the Fourth Proportional to 99.72, 149.67 and 72.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99.72 : 149.67 = 72.72 : x
2. Step 2: Convert to fraction form
   99.72/149.67 = 72.72/x
3. Step 3: Cross multiply
   99.72x = 149.67 × 72.72
4. Step 4: Simplify right side
   99.72x = 10,884.00
5. Step 5: Solve for x
   x = 10,884.00/99.72
6. Step 6: Final answer
   x = 109.15