Finding the Fourth Proportional to 89.57, 123.61 and 63.35

Step by Step Solution

1. Step 1: Write the proportion equation
   89.57 : 123.61 = 63.35 : x
2. Step 2: Convert to fraction form
   89.57/123.61 = 63.35/x
3. Step 3: Cross multiply
   89.57x = 123.61 × 63.35
4. Step 4: Simplify right side
   89.57x = 7,830.69
5. Step 5: Solve for x
   x = 7,830.69/89.57
6. Step 6: Final answer
   x = 87.43