Finding the Third Proportional to 387,009 and 821,038.50

Step by Step Solution

1. Step 1: Write the proportion equation
   387,009 : 821,038.50 = 821,038.50 : x
2. Step 2: Convert to fraction form
   387,009/821,038.50 = 821,038.50/x
3. Step 3: Cross multiply
   387,009x = 821,038.50 × 821,038.50
4. Step 4: Simplify right side
   387,009x = 674,104,218,482.25
5. Step 5: Solve for x
   x = 674,104,218,482.25/387,009
6. Step 6: Final answer
   x = 1,741,830.86