Finding the Fourth Proportional to 100.93, 139.49 and 88.89

Step by Step Solution

1. Step 1: Write the proportion equation
   100.93 : 139.49 = 88.89 : x
2. Step 2: Convert to fraction form
   100.93/139.49 = 88.89/x
3. Step 3: Cross multiply
   100.93x = 139.49 × 88.89
4. Step 4: Simplify right side
   100.93x = 12,399.27
5. Step 5: Solve for x
   x = 12,399.27/100.93
6. Step 6: Final answer
   x = 122.85