Finding the Third Proportional to 428,597.25 and 916,243.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,597.25 : 916,243.50 = 916,243.50 : x
2. Step 2: Convert to fraction form
   428,597.25/916,243.50 = 916,243.50/x
3. Step 3: Cross multiply
   428,597.25x = 916,243.50 × 916,243.50
4. Step 4: Simplify right side
   428,597.25x = 839,502,151,292.25
5. Step 5: Solve for x
   x = 839,502,151,292.25/428,597.25
6. Step 6: Final answer
   x = 1,958,720.34