Finding the Third Proportional to 39.66 and 59.91

Step by Step Solution

1. Step 1: Write the proportion equation
   39.66 : 59.91 = 59.91 : x
2. Step 2: Convert to fraction form
   39.66/59.91 = 59.91/x
3. Step 3: Cross multiply
   39.66x = 59.91 × 59.91
4. Step 4: Simplify right side
   39.66x = 3,588.76
5. Step 5: Solve for x
   x = 3,588.76/39.66
6. Step 6: Final answer
   x = 90.50