Finding the Third Proportional to 414,324 and 639,802.50

Step by Step Solution

1. Step 1: Write the proportion equation
   414,324 : 639,802.50 = 639,802.50 : x
2. Step 2: Convert to fraction form
   414,324/639,802.50 = 639,802.50/x
3. Step 3: Cross multiply
   414,324x = 639,802.50 × 639,802.50
4. Step 4: Simplify right side
   414,324x = 409,347,239,006.25
5. Step 5: Solve for x
   x = 409,347,239,006.25/414,324
6. Step 6: Final answer
   x = 987,988.24