Finding the Third Proportional to 387,484 and 821,061

Step by Step Solution

1. Step 1: Write the proportion equation
   387,484 : 821,061 = 821,061 : x
2. Step 2: Convert to fraction form
   387,484/821,061 = 821,061/x
3. Step 3: Cross multiply
   387,484x = 821,061 × 821,061
4. Step 4: Simplify right side
   387,484x = 674,141,165,721
5. Step 5: Solve for x
   x = 674,141,165,721/387,484
6. Step 6: Final answer
   x = 1,739,790.97