Finding the Third Proportional to 863,400 and 1,307,142

Step by Step Solution

1. Step 1: Write the proportion equation
   863,400 : 1,307,142 = 1,307,142 : x
2. Step 2: Convert to fraction form
   863,400/1,307,142 = 1,307,142/x
3. Step 3: Cross multiply
   863,400x = 1,307,142 × 1,307,142
4. Step 4: Simplify right side
   863,400x = 1,708,620,208,164
5. Step 5: Solve for x
   x = 1,708,620,208,164/863,400
6. Step 6: Final answer
   x = 1,978,943.95