Finding the Fourth Proportional to 100.05, 149.99 and 72.69

Step by Step Solution

1. Step 1: Write the proportion equation
   100.05 : 149.99 = 72.69 : x
2. Step 2: Convert to fraction form
   100.05/149.99 = 72.69/x
3. Step 3: Cross multiply
   100.05x = 149.99 × 72.69
4. Step 4: Simplify right side
   100.05x = 10,902.41
5. Step 5: Solve for x
   x = 10,902.41/100.05
6. Step 6: Final answer
   x = 108.97