Finding the Third Proportional to 57.28 and 91.29

Step by Step Solution

1. Step 1: Write the proportion equation
   57.28 : 91.29 = 91.29 : x
2. Step 2: Convert to fraction form
   57.28/91.29 = 91.29/x
3. Step 3: Cross multiply
   57.28x = 91.29 × 91.29
4. Step 4: Simplify right side
   57.28x = 8,333.69
5. Step 5: Solve for x
   x = 8,333.69/57.28
6. Step 6: Final answer
   x = 145.49