Finding the Third Proportional to 2,138,442 and 4,428,461

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138,442 : 4,428,461 = 4,428,461 : x
2. Step 2: Convert to fraction form
   2,138,442/4,428,461 = 4,428,461/x
3. Step 3: Cross multiply
   2,138,442x = 4,428,461 × 4,428,461
4. Step 4: Simplify right side
   2,138,442x = 19,611,266,828,521
5. Step 5: Solve for x
   x = 19,611,266,828,521/2,138,442
6. Step 6: Final answer
   x = 9,170,820.08