Finding the Third Proportional to 2,138,438 and 4,428,453

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138,438 : 4,428,453 = 4,428,453 : x
2. Step 2: Convert to fraction form
   2,138,438/4,428,453 = 4,428,453/x
3. Step 3: Cross multiply
   2,138,438x = 4,428,453 × 4,428,453
4. Step 4: Simplify right side
   2,138,438x = 19,611,195,973,209
5. Step 5: Solve for x
   x = 19,611,195,973,209/2,138,438
6. Step 6: Final answer
   x = 9,170,804.10