Finding the Fourth Proportional to 101.26, 139.89 and 78.01

Step by Step Solution

1. Step 1: Write the proportion equation
   101.26 : 139.89 = 78.01 : x
2. Step 2: Convert to fraction form
   101.26/139.89 = 78.01/x
3. Step 3: Cross multiply
   101.26x = 139.89 × 78.01
4. Step 4: Simplify right side
   101.26x = 10,912.76
5. Step 5: Solve for x
   x = 10,912.76/101.26
6. Step 6: Final answer
   x = 107.77