Finding the Third Proportional to 339,786 and 539,812.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,786 : 539,812.50 = 539,812.50 : x
2. Step 2: Convert to fraction form
   339,786/539,812.50 = 539,812.50/x
3. Step 3: Cross multiply
   339,786x = 539,812.50 × 539,812.50
4. Step 4: Simplify right side
   339,786x = 291,397,535,156.25
5. Step 5: Solve for x
   x = 291,397,535,156.25/339,786
6. Step 6: Final answer
   x = 857,591.35