Finding the Third Proportional to 61.17 and 88.80

Step by Step Solution

1. Step 1: Write the proportion equation
   61.17 : 88.80 = 88.80 : x
2. Step 2: Convert to fraction form
   61.17/88.80 = 88.80/x
3. Step 3: Cross multiply
   61.17x = 88.80 × 88.80
4. Step 4: Simplify right side
   61.17x = 7,886.27
5. Step 5: Solve for x
   x = 7,886.27/61.17
6. Step 6: Final answer
   x = 128.92