Finding the Fourth Proportional to 89.98, 123.09 and 89.47

Step by Step Solution

1. Step 1: Write the proportion equation
   89.98 : 123.09 = 89.47 : x
2. Step 2: Convert to fraction form
   89.98/123.09 = 89.47/x
3. Step 3: Cross multiply
   89.98x = 123.09 × 89.47
4. Step 4: Simplify right side
   89.98x = 11,012.86
5. Step 5: Solve for x
   x = 11,012.86/89.98
6. Step 6: Final answer
   x = 122.39