Finding the Third Proportional to 786,402 and 1,687,500

Step by Step Solution

1. Step 1: Write the proportion equation
   786,402 : 1,687,500 = 1,687,500 : x
2. Step 2: Convert to fraction form
   786,402/1,687,500 = 1,687,500/x
3. Step 3: Cross multiply
   786,402x = 1,687,500 × 1,687,500
4. Step 4: Simplify right side
   786,402x = 2,847,656,250,000
5. Step 5: Solve for x
   x = 2,847,656,250,000/786,402
6. Step 6: Final answer
   x = 3,621,120.30