Finding the Third Proportional to 612,390 and 1,329,936

Step by Step Solution

1. Step 1: Write the proportion equation
   612,390 : 1,329,936 = 1,329,936 : x
2. Step 2: Convert to fraction form
   612,390/1,329,936 = 1,329,936/x
3. Step 3: Cross multiply
   612,390x = 1,329,936 × 1,329,936
4. Step 4: Simplify right side
   612,390x = 1,768,729,764,096
5. Step 5: Solve for x
   x = 1,768,729,764,096/612,390
6. Step 6: Final answer
   x = 2,888,240.77