Finding the Third Proportional to 387,099 and 801,411.75

Step by Step Solution

1. Step 1: Write the proportion equation
   387,099 : 801,411.75 = 801,411.75 : x
2. Step 2: Convert to fraction form
   387,099/801,411.75 = 801,411.75/x
3. Step 3: Cross multiply
   387,099x = 801,411.75 × 801,411.75
4. Step 4: Simplify right side
   387,099x = 642,260,793,038.06
5. Step 5: Solve for x
   x = 642,260,793,038.06/387,099
6. Step 6: Final answer
   x = 1,659,164.18