Finding the Third Proportional to 426,189 and 647,059.50

Step by Step Solution

1. Step 1: Write the proportion equation
   426,189 : 647,059.50 = 647,059.50 : x
2. Step 2: Convert to fraction form
   426,189/647,059.50 = 647,059.50/x
3. Step 3: Cross multiply
   426,189x = 647,059.50 × 647,059.50
4. Step 4: Simplify right side
   426,189x = 418,685,996,540.25
5. Step 5: Solve for x
   x = 418,685,996,540.25/426,189
6. Step 6: Final answer
   x = 982,395.13