Finding the Third Proportional to 300,802.50 and 642,207

Step by Step Solution

1. Step 1: Write the proportion equation
   300,802.50 : 642,207 = 642,207 : x
2. Step 2: Convert to fraction form
   300,802.50/642,207 = 642,207/x
3. Step 3: Cross multiply
   300,802.50x = 642,207 × 642,207
4. Step 4: Simplify right side
   300,802.50x = 412,429,830,849
5. Step 5: Solve for x
   x = 412,429,830,849/300,802.50
6. Step 6: Final answer
   x = 1,371,098.41