Finding the Third Proportional to 643,875 and 1,271,535

Step by Step Solution

1. Step 1: Write the proportion equation
   643,875 : 1,271,535 = 1,271,535 : x
2. Step 2: Convert to fraction form
   643,875/1,271,535 = 1,271,535/x
3. Step 3: Cross multiply
   643,875x = 1,271,535 × 1,271,535
4. Step 4: Simplify right side
   643,875x = 1,616,801,256,225
5. Step 5: Solve for x
   x = 1,616,801,256,225/643,875
6. Step 6: Final answer
   x = 2,511,048.35