Finding the Third Proportional to 55.31 and 86.25

Step by Step Solution

1. Step 1: Write the proportion equation
   55.31 : 86.25 = 86.25 : x
2. Step 2: Convert to fraction form
   55.31/86.25 = 86.25/x
3. Step 3: Cross multiply
   55.31x = 86.25 × 86.25
4. Step 4: Simplify right side
   55.31x = 7,439.06
5. Step 5: Solve for x
   x = 7,439.06/55.31
6. Step 6: Final answer
   x = 134.49