Finding the Fourth Proportional to 89.68, 123.79 and 62.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89.68 : 123.79 = 62.12 : x
2. Step 2: Convert to fraction form
   89.68/123.79 = 62.12/x
3. Step 3: Cross multiply
   89.68x = 123.79 × 62.12
4. Step 4: Simplify right side
   89.68x = 7,689.83
5. Step 5: Solve for x
   x = 7,689.83/89.68
6. Step 6: Final answer
   x = 85.75