Finding the Fourth Proportional to 89.15, 123.17 and 70.88

Step by Step Solution

1. Step 1: Write the proportion equation
   89.15 : 123.17 = 70.88 : x
2. Step 2: Convert to fraction form
   89.15/123.17 = 70.88/x
3. Step 3: Cross multiply
   89.15x = 123.17 × 70.88
4. Step 4: Simplify right side
   89.15x = 8,729.32
5. Step 5: Solve for x
   x = 8,729.32/89.15
6. Step 6: Final answer
   x = 97.92