Finding the Fourth Proportional to 89.42, 123.34 and 56.61

Step by Step Solution

1. Step 1: Write the proportion equation
   89.42 : 123.34 = 56.61 : x
2. Step 2: Convert to fraction form
   89.42/123.34 = 56.61/x
3. Step 3: Cross multiply
   89.42x = 123.34 × 56.61
4. Step 4: Simplify right side
   89.42x = 6,982.28
5. Step 5: Solve for x
   x = 6,982.28/89.42
6. Step 6: Final answer
   x = 78.08