Finding the Fourth Proportional to 101.49, 139.83 and 78.27

Step by Step Solution

1. Step 1: Write the proportion equation
   101.49 : 139.83 = 78.27 : x
2. Step 2: Convert to fraction form
   101.49/139.83 = 78.27/x
3. Step 3: Cross multiply
   101.49x = 139.83 × 78.27
4. Step 4: Simplify right side
   101.49x = 10,943.68
5. Step 5: Solve for x
   x = 10,943.68/101.49
6. Step 6: Final answer
   x = 107.83