Finding the Third Proportional to 401.06 and 511.88

Step by Step Solution

1. Step 1: Write the proportion equation
   401.06 : 511.88 = 511.88 : x
2. Step 2: Convert to fraction form
   401.06/511.88 = 511.88/x
3. Step 3: Cross multiply
   401.06x = 511.88 × 511.88
4. Step 4: Simplify right side
   401.06x = 262,016.02
5. Step 5: Solve for x
   x = 262,016.02/401.06
6. Step 6: Final answer
   x = 653.30