Finding the Fourth Proportional to 100.86, 139.31 and 73.18

Step by Step Solution

1. Step 1: Write the proportion equation
   100.86 : 139.31 = 73.18 : x
2. Step 2: Convert to fraction form
   100.86/139.31 = 73.18/x
3. Step 3: Cross multiply
   100.86x = 139.31 × 73.18
4. Step 4: Simplify right side
   100.86x = 10,194.51
5. Step 5: Solve for x
   x = 10,194.51/100.86
6. Step 6: Final answer
   x = 101.08