Finding the Third Proportional to 643,280 and 1,375,089

Step by Step Solution

1. Step 1: Write the proportion equation
   643,280 : 1,375,089 = 1,375,089 : x
2. Step 2: Convert to fraction form
   643,280/1,375,089 = 1,375,089/x
3. Step 3: Cross multiply
   643,280x = 1,375,089 × 1,375,089
4. Step 4: Simplify right side
   643,280x = 1,890,869,757,921
5. Step 5: Solve for x
   x = 1,890,869,757,921/643,280
6. Step 6: Final answer
   x = 2,939,419.47