Finding the Third Proportional to 387,404 and 843,428

Step by Step Solution

1. Step 1: Write the proportion equation
   387,404 : 843,428 = 843,428 : x
2. Step 2: Convert to fraction form
   387,404/843,428 = 843,428/x
3. Step 3: Cross multiply
   387,404x = 843,428 × 843,428
4. Step 4: Simplify right side
   387,404x = 711,370,791,184
5. Step 5: Solve for x
   x = 711,370,791,184/387,404
6. Step 6: Final answer
   x = 1,836,250.51