Finding the Third Proportional to 863,402 and 1,307,145

Step by Step Solution

1. Step 1: Write the proportion equation
   863,402 : 1,307,145 = 1,307,145 : x
2. Step 2: Convert to fraction form
   863,402/1,307,145 = 1,307,145/x
3. Step 3: Cross multiply
   863,402x = 1,307,145 × 1,307,145
4. Step 4: Simplify right side
   863,402x = 1,708,628,051,025
5. Step 5: Solve for x
   x = 1,708,628,051,025/863,402
6. Step 6: Final answer
   x = 1,978,948.45