Finding the Fourth Proportional to 101.09, 139.69 and 71.93

Step by Step Solution

1. Step 1: Write the proportion equation
   101.09 : 139.69 = 71.93 : x
2. Step 2: Convert to fraction form
   101.09/139.69 = 71.93/x
3. Step 3: Cross multiply
   101.09x = 139.69 × 71.93
4. Step 4: Simplify right side
   101.09x = 10,048.34
5. Step 5: Solve for x
   x = 10,048.34/101.09
6. Step 6: Final answer
   x = 99.40