Finding the Fourth Proportional to 123.69, 170.71 and 71.25

Step by Step Solution

1. Step 1: Write the proportion equation
   123.69 : 170.71 = 71.25 : x
2. Step 2: Convert to fraction form
   123.69/170.71 = 71.25/x
3. Step 3: Cross multiply
   123.69x = 170.71 × 71.25
4. Step 4: Simplify right side
   123.69x = 12,162.27
5. Step 5: Solve for x
   x = 12,162.27/123.69
6. Step 6: Final answer
   x = 98.33