Finding the Third Proportional to 5,490,390 and 7,920,561

Step by Step Solution

1. Step 1: Write the proportion equation
   5,490,390 : 7,920,561 = 7,920,561 : x
2. Step 2: Convert to fraction form
   5,490,390/7,920,561 = 7,920,561/x
3. Step 3: Cross multiply
   5,490,390x = 7,920,561 × 7,920,561
4. Step 4: Simplify right side
   5,490,390x = 62,735,286,554,721
5. Step 5: Solve for x
   x = 62,735,286,554,721/5,490,390
6. Step 6: Final answer
   x = 11,426,380.74