Finding the Fourth Proportional to 123.49, 170.59 and 101.89

Step by Step Solution

1. Step 1: Write the proportion equation
   123.49 : 170.59 = 101.89 : x
2. Step 2: Convert to fraction form
   123.49/170.59 = 101.89/x
3. Step 3: Cross multiply
   123.49x = 170.59 × 101.89
4. Step 4: Simplify right side
   123.49x = 17,380.56
5. Step 5: Solve for x
   x = 17,380.56/123.49
6. Step 6: Final answer
   x = 140.75