Finding the Third Proportional to 319,590.56 and 678,592.69

Step by Step Solution

1. Step 1: Write the proportion equation
   319,590.56 : 678,592.69 = 678,592.69 : x
2. Step 2: Convert to fraction form
   319,590.56/678,592.69 = 678,592.69/x
3. Step 3: Cross multiply
   319,590.56x = 678,592.69 × 678,592.69
4. Step 4: Simplify right side
   319,590.56x = 460,488,035,528.47
5. Step 5: Solve for x
   x = 460,488,035,528.47/319,590.56
6. Step 6: Final answer
   x = 1,440,868.69