Finding the Third Proportional to 1,261,492 and 2,688,138

Step by Step Solution

1. Step 1: Write the proportion equation
   1,261,492 : 2,688,138 = 2,688,138 : x
2. Step 2: Convert to fraction form
   1,261,492/2,688,138 = 2,688,138/x
3. Step 3: Cross multiply
   1,261,492x = 2,688,138 × 2,688,138
4. Step 4: Simplify right side
   1,261,492x = 7,226,085,907,044
5. Step 5: Solve for x
   x = 7,226,085,907,044/1,261,492
6. Step 6: Final answer
   x = 5,728,205.89