Finding the Fourth Proportional to 88.72, 122.41 and 61.15

Step by Step Solution

1. Step 1: Write the proportion equation
   88.72 : 122.41 = 61.15 : x
2. Step 2: Convert to fraction form
   88.72/122.41 = 61.15/x
3. Step 3: Cross multiply
   88.72x = 122.41 × 61.15
4. Step 4: Simplify right side
   88.72x = 7,485.37
5. Step 5: Solve for x
   x = 7,485.37/88.72
6. Step 6: Final answer
   x = 84.37