Finding the Fourth Proportional to 89.43, 123.71 and 83.63

Step by Step Solution

1. Step 1: Write the proportion equation
   89.43 : 123.71 = 83.63 : x
2. Step 2: Convert to fraction form
   89.43/123.71 = 83.63/x
3. Step 3: Cross multiply
   89.43x = 123.71 × 83.63
4. Step 4: Simplify right side
   89.43x = 10,344.83
5. Step 5: Solve for x
   x = 10,344.83/89.43
6. Step 6: Final answer
   x = 115.68