Finding the Fourth Proportional to 89.11, 123.01 and 61.57

Step by Step Solution

1. Step 1: Write the proportion equation
   89.11 : 123.01 = 61.57 : x
2. Step 2: Convert to fraction form
   89.11/123.01 = 61.57/x
3. Step 3: Cross multiply
   89.11x = 123.01 × 61.57
4. Step 4: Simplify right side
   89.11x = 7,573.73
5. Step 5: Solve for x
   x = 7,573.73/89.11
6. Step 6: Final answer
   x = 84.99