Finding the Third Proportional to 1,118,920 and 1,687,668

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118,920 : 1,687,668 = 1,687,668 : x
2. Step 2: Convert to fraction form
   1,118,920/1,687,668 = 1,687,668/x
3. Step 3: Cross multiply
   1,118,920x = 1,687,668 × 1,687,668
4. Step 4: Simplify right side
   1,118,920x = 2,848,223,278,224
5. Step 5: Solve for x
   x = 2,848,223,278,224/1,118,920
6. Step 6: Final answer
   x = 2,545,511.10