Finding the Fourth Proportional to 123.25, 170.10 and 71.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123.25 : 170.10 = 71.50 : x
2. Step 2: Convert to fraction form
   123.25/170.10 = 71.50/x
3. Step 3: Cross multiply
   123.25x = 170.10 × 71.50
4. Step 4: Simplify right side
   123.25x = 12,162.15
5. Step 5: Solve for x
   x = 12,162.15/123.25
6. Step 6: Final answer
   x = 98.68