Finding the Fourth Proportional to 89.31, 123.08 and 63.39

Step by Step Solution

1. Step 1: Write the proportion equation
   89.31 : 123.08 = 63.39 : x
2. Step 2: Convert to fraction form
   89.31/123.08 = 63.39/x
3. Step 3: Cross multiply
   89.31x = 123.08 × 63.39
4. Step 4: Simplify right side
   89.31x = 7,801.72
5. Step 5: Solve for x
   x = 7,801.72/89.31
6. Step 6: Final answer
   x = 87.36