Finding the Fourth Proportional to 89.39, 123.28 and 61.37

Step by Step Solution

1. Step 1: Write the proportion equation
   89.39 : 123.28 = 61.37 : x
2. Step 2: Convert to fraction form
   89.39/123.28 = 61.37/x
3. Step 3: Cross multiply
   89.39x = 123.28 × 61.37
4. Step 4: Simplify right side
   89.39x = 7,565.02
5. Step 5: Solve for x
   x = 7,565.02/89.39
6. Step 6: Final answer
   x = 84.63