Finding the Fourth Proportional to 89.42, 123.30 and 71.06

Step by Step Solution

1. Step 1: Write the proportion equation
   89.42 : 123.30 = 71.06 : x
2. Step 2: Convert to fraction form
   89.42/123.30 = 71.06/x
3. Step 3: Cross multiply
   89.42x = 123.30 × 71.06
4. Step 4: Simplify right side
   89.42x = 8,761.08
5. Step 5: Solve for x
   x = 8,761.08/89.42
6. Step 6: Final answer
   x = 97.98