Finding the Fourth Proportional to 89.16, 123.15 and 61.62

Step by Step Solution

1. Step 1: Write the proportion equation
   89.16 : 123.15 = 61.62 : x
2. Step 2: Convert to fraction form
   89.16/123.15 = 61.62/x
3. Step 3: Cross multiply
   89.16x = 123.15 × 61.62
4. Step 4: Simplify right side
   89.16x = 7,588.50
5. Step 5: Solve for x
   x = 7,588.50/89.16
6. Step 6: Final answer
   x = 85.11