Finding the Fourth Proportional to 89.39, 123.39 and 63.47

Step by Step Solution

1. Step 1: Write the proportion equation
   89.39 : 123.39 = 63.47 : x
2. Step 2: Convert to fraction form
   89.39/123.39 = 63.47/x
3. Step 3: Cross multiply
   89.39x = 123.39 × 63.47
4. Step 4: Simplify right side
   89.39x = 7,831.56
5. Step 5: Solve for x
   x = 7,831.56/89.39
6. Step 6: Final answer
   x = 87.61