Finding the Third Proportional to 387,392 and 843,404

Step by Step Solution

1. Step 1: Write the proportion equation
   387,392 : 843,404 = 843,404 : x
2. Step 2: Convert to fraction form
   387,392/843,404 = 843,404/x
3. Step 3: Cross multiply
   387,392x = 843,404 × 843,404
4. Step 4: Simplify right side
   387,392x = 711,330,307,216
5. Step 5: Solve for x
   x = 711,330,307,216/387,392
6. Step 6: Final answer
   x = 1,836,202.88