Finding the Fourth Proportional to 89.34, 123.12 and 63.42

Step by Step Solution

1. Step 1: Write the proportion equation
   89.34 : 123.12 = 63.42 : x
2. Step 2: Convert to fraction form
   89.34/123.12 = 63.42/x
3. Step 3: Cross multiply
   89.34x = 123.12 × 63.42
4. Step 4: Simplify right side
   89.34x = 7,808.27
5. Step 5: Solve for x
   x = 7,808.27/89.34
6. Step 6: Final answer
   x = 87.40