Finding the Third Proportional to 315,631.69 and 672,490.69

Step by Step Solution

1. Step 1: Write the proportion equation
   315,631.69 : 672,490.69 = 672,490.69 : x
2. Step 2: Convert to fraction form
   315,631.69/672,490.69 = 672,490.69/x
3. Step 3: Cross multiply
   315,631.69x = 672,490.69 × 672,490.69
4. Step 4: Simplify right side
   315,631.69x = 452,243,724,774.22
5. Step 5: Solve for x
   x = 452,243,724,774.22/315,631.69
6. Step 6: Final answer
   x = 1,432,821.05