Finding the Fourth Proportional to 101.48, 139.98 and 72.38

Step by Step Solution

1. Step 1: Write the proportion equation
   101.48 : 139.98 = 72.38 : x
2. Step 2: Convert to fraction form
   101.48/139.98 = 72.38/x
3. Step 3: Cross multiply
   101.48x = 139.98 × 72.38
4. Step 4: Simplify right side
   101.48x = 10,131.75
5. Step 5: Solve for x
   x = 10,131.75/101.48
6. Step 6: Final answer
   x = 99.84