Finding the Third Proportional to 199,300.50 and 428,145.75

Step by Step Solution

1. Step 1: Write the proportion equation
   199,300.50 : 428,145.75 = 428,145.75 : x
2. Step 2: Convert to fraction form
   199,300.50/428,145.75 = 428,145.75/x
3. Step 3: Cross multiply
   199,300.50x = 428,145.75 × 428,145.75
4. Step 4: Simplify right side
   199,300.50x = 183,308,783,243.06
5. Step 5: Solve for x
   x = 183,308,783,243.06/199,300.50
6. Step 6: Final answer
   x = 919,760.78