Finding the Fourth Proportional to 101.35, 139.71 and 76.83

Step by Step Solution

1. Step 1: Write the proportion equation
   101.35 : 139.71 = 76.83 : x
2. Step 2: Convert to fraction form
   101.35/139.71 = 76.83/x
3. Step 3: Cross multiply
   101.35x = 139.71 × 76.83
4. Step 4: Simplify right side
   101.35x = 10,733.92
5. Step 5: Solve for x
   x = 10,733.92/101.35
6. Step 6: Final answer
   x = 105.91