Finding the Fourth Proportional to 100.89, 139.32 and 68.18

Step by Step Solution

1. Step 1: Write the proportion equation
   100.89 : 139.32 = 68.18 : x
2. Step 2: Convert to fraction form
   100.89/139.32 = 68.18/x
3. Step 3: Cross multiply
   100.89x = 139.32 × 68.18
4. Step 4: Simplify right side
   100.89x = 9,498.14
5. Step 5: Solve for x
   x = 9,498.14/100.89
6. Step 6: Final answer
   x = 94.14