Finding the Fourth Proportional to 99.10, 149.17 and 72.22

Step by Step Solution

1. Step 1: Write the proportion equation
   99.10 : 149.17 = 72.22 : x
2. Step 2: Convert to fraction form
   99.10/149.17 = 72.22/x
3. Step 3: Cross multiply
   99.10x = 149.17 × 72.22
4. Step 4: Simplify right side
   99.10x = 10,773.06
5. Step 5: Solve for x
   x = 10,773.06/99.10
6. Step 6: Final answer
   x = 108.71