Finding the Fourth Proportional to 100.06, 149.96 and 72.88

Step by Step Solution

1. Step 1: Write the proportion equation
   100.06 : 149.96 = 72.88 : x
2. Step 2: Convert to fraction form
   100.06/149.96 = 72.88/x
3. Step 3: Cross multiply
   100.06x = 149.96 × 72.88
4. Step 4: Simplify right side
   100.06x = 10,928.72
5. Step 5: Solve for x
   x = 10,928.72/100.06
6. Step 6: Final answer
   x = 109.22