Finding the Fourth Proportional to 89.79, 123.86 and 62.17

Step by Step Solution

1. Step 1: Write the proportion equation
   89.79 : 123.86 = 62.17 : x
2. Step 2: Convert to fraction form
   89.79/123.86 = 62.17/x
3. Step 3: Cross multiply
   89.79x = 123.86 × 62.17
4. Step 4: Simplify right side
   89.79x = 7,700.38
5. Step 5: Solve for x
   x = 7,700.38/89.79
6. Step 6: Final answer
   x = 85.76