Finding the Third Proportional to 386,172 and 807,634.50

Step by Step Solution

1. Step 1: Write the proportion equation
   386,172 : 807,634.50 = 807,634.50 : x
2. Step 2: Convert to fraction form
   386,172/807,634.50 = 807,634.50/x
3. Step 3: Cross multiply
   386,172x = 807,634.50 × 807,634.50
4. Step 4: Simplify right side
   386,172x = 652,273,485,590.25
5. Step 5: Solve for x
   x = 652,273,485,590.25/386,172
6. Step 6: Final answer
   x = 1,689,075.04