Finding the Third Proportional to 199.27 and 428.06

Step by Step Solution

1. Step 1: Write the proportion equation
   199.27 : 428.06 = 428.06 : x
2. Step 2: Convert to fraction form
   199.27/428.06 = 428.06/x
3. Step 3: Cross multiply
   199.27x = 428.06 × 428.06
4. Step 4: Simplify right side
   199.27x = 183,237.50
5. Step 5: Solve for x
   x = 183,237.50/199.27
6. Step 6: Final answer
   x = 919.56