Finding the Third Proportional to 312,510 and 442,488.75

Step by Step Solution

1. Step 1: Write the proportion equation
   312,510 : 442,488.75 = 442,488.75 : x
2. Step 2: Convert to fraction form
   312,510/442,488.75 = 442,488.75/x
3. Step 3: Cross multiply
   312,510x = 442,488.75 × 442,488.75
4. Step 4: Simplify right side
   312,510x = 195,796,293,876.56
5. Step 5: Solve for x
   x = 195,796,293,876.56/312,510
6. Step 6: Final answer
   x = 626,528.09