Finding the Fourth Proportional to 101.33, 139.01 and 100.39

Step by Step Solution

1. Step 1: Write the proportion equation
   101.33 : 139.01 = 100.39 : x
2. Step 2: Convert to fraction form
   101.33/139.01 = 100.39/x
3. Step 3: Cross multiply
   101.33x = 139.01 × 100.39
4. Step 4: Simplify right side
   101.33x = 13,955.12
5. Step 5: Solve for x
   x = 13,955.12/101.33
6. Step 6: Final answer
   x = 137.72