Finding the Fourth Proportional to 89.48, 123.42 and 61.81

Step by Step Solution

1. Step 1: Write the proportion equation
   89.48 : 123.42 = 61.81 : x
2. Step 2: Convert to fraction form
   89.48/123.42 = 61.81/x
3. Step 3: Cross multiply
   89.48x = 123.42 × 61.81
4. Step 4: Simplify right side
   89.48x = 7,628.59
5. Step 5: Solve for x
   x = 7,628.59/89.48
6. Step 6: Final answer
   x = 85.25