Finding the Third Proportional to 643,187 and 945,510

Step by Step Solution

1. Step 1: Write the proportion equation
   643,187 : 945,510 = 945,510 : x
2. Step 2: Convert to fraction form
   643,187/945,510 = 945,510/x
3. Step 3: Cross multiply
   643,187x = 945,510 × 945,510
4. Step 4: Simplify right side
   643,187x = 893,989,160,100
5. Step 5: Solve for x
   x = 893,989,160,100/643,187
6. Step 6: Final answer
   x = 1,389,936.61