Finding the Fourth Proportional to 101.38, 139.76 and 72.22

Step by Step Solution

1. Step 1: Write the proportion equation
   101.38 : 139.76 = 72.22 : x
2. Step 2: Convert to fraction form
   101.38/139.76 = 72.22/x
3. Step 3: Cross multiply
   101.38x = 139.76 × 72.22
4. Step 4: Simplify right side
   101.38x = 10,093.47
5. Step 5: Solve for x
   x = 10,093.47/101.38
6. Step 6: Final answer
   x = 99.56