Finding the Third Proportional to 387,990 and 837,144

Step by Step Solution

1. Step 1: Write the proportion equation
   387,990 : 837,144 = 837,144 : x
2. Step 2: Convert to fraction form
   387,990/837,144 = 837,144/x
3. Step 3: Cross multiply
   387,990x = 837,144 × 837,144
4. Step 4: Simplify right side
   387,990x = 700,810,076,736
5. Step 5: Solve for x
   x = 700,810,076,736/387,990
6. Step 6: Final answer
   x = 1,806,258.09