Finding the Fourth Proportional to 89.42, 123.36 and 61.75

Step by Step Solution

1. Step 1: Write the proportion equation
   89.42 : 123.36 = 61.75 : x
2. Step 2: Convert to fraction form
   89.42/123.36 = 61.75/x
3. Step 3: Cross multiply
   89.42x = 123.36 × 61.75
4. Step 4: Simplify right side
   89.42x = 7,616.86
5. Step 5: Solve for x
   x = 7,616.86/89.42
6. Step 6: Final answer
   x = 85.18