Finding the Third Proportional to 1,388,138 and 2,099,715

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,138 : 2,099,715 = 2,099,715 : x
2. Step 2: Convert to fraction form
   1,388,138/2,099,715 = 2,099,715/x
3. Step 3: Cross multiply
   1,388,138x = 2,099,715 × 2,099,715
4. Step 4: Simplify right side
   1,388,138x = 4,408,803,081,225
5. Step 5: Solve for x
   x = 4,408,803,081,225/1,388,138
6. Step 6: Final answer
   x = 3,176,055.32