Finding the Fourth Proportional to 100.98, 139.32 and 69.89

Step by Step Solution

1. Step 1: Write the proportion equation
   100.98 : 139.32 = 69.89 : x
2. Step 2: Convert to fraction form
   100.98/139.32 = 69.89/x
3. Step 3: Cross multiply
   100.98x = 139.32 × 69.89
4. Step 4: Simplify right side
   100.98x = 9,736.38
5. Step 5: Solve for x
   x = 9,736.38/100.98
6. Step 6: Final answer
   x = 96.42