Finding the Fourth Proportional to 100.05, 137.86 and 76.73

Step by Step Solution

1. Step 1: Write the proportion equation
   100.05 : 137.86 = 76.73 : x
2. Step 2: Convert to fraction form
   100.05/137.86 = 76.73/x
3. Step 3: Cross multiply
   100.05x = 137.86 × 76.73
4. Step 4: Simplify right side
   100.05x = 10,578.15
5. Step 5: Solve for x
   x = 10,578.15/100.05
6. Step 6: Final answer
   x = 105.73