Finding the Third Proportional to 387,411.50 and 821,714

Step by Step Solution

1. Step 1: Write the proportion equation
   387,411.50 : 821,714 = 821,714 : x
2. Step 2: Convert to fraction form
   387,411.50/821,714 = 821,714/x
3. Step 3: Cross multiply
   387,411.50x = 821,714 × 821,714
4. Step 4: Simplify right side
   387,411.50x = 675,213,897,796
5. Step 5: Solve for x
   x = 675,213,897,796/387,411.50
6. Step 6: Final answer
   x = 1,742,885.53