Finding the Third Proportional to 1,199,858 and 1,687,520

Step by Step Solution

1. Step 1: Write the proportion equation
   1,199,858 : 1,687,520 = 1,687,520 : x
2. Step 2: Convert to fraction form
   1,199,858/1,687,520 = 1,687,520/x
3. Step 3: Cross multiply
   1,199,858x = 1,687,520 × 1,687,520
4. Step 4: Simplify right side
   1,199,858x = 2,847,723,750,400
5. Step 5: Solve for x
   x = 2,847,723,750,400/1,199,858
6. Step 6: Final answer
   x = 2,373,383.98