Finding the Third Proportional to 618,432 and 1,339,200

Step by Step Solution

1. Step 1: Write the proportion equation
   618,432 : 1,339,200 = 1,339,200 : x
2. Step 2: Convert to fraction form
   618,432/1,339,200 = 1,339,200/x
3. Step 3: Cross multiply
   618,432x = 1,339,200 × 1,339,200
4. Step 4: Simplify right side
   618,432x = 1,793,456,640,000
5. Step 5: Solve for x
   x = 1,793,456,640,000/618,432
6. Step 6: Final answer
   x = 2,900,006.21