Finding the Third Proportional to 426,829.50 and 643,061.53

Step by Step Solution

1. Step 1: Write the proportion equation
   426,829.50 : 643,061.53 = 643,061.53 : x
2. Step 2: Convert to fraction form
   426,829.50/643,061.53 = 643,061.53/x
3. Step 3: Cross multiply
   426,829.50x = 643,061.53 × 643,061.53
4. Step 4: Simplify right side
   426,829.50x = 413,528,132,973.60
5. Step 5: Solve for x
   x = 413,528,132,973.60/426,829.50
6. Step 6: Final answer
   x = 968,836.81