Finding the Third Proportional to 287,118 and 618,111

Step by Step Solution

1. Step 1: Write the proportion equation
   287,118 : 618,111 = 618,111 : x
2. Step 2: Convert to fraction form
   287,118/618,111 = 618,111/x
3. Step 3: Cross multiply
   287,118x = 618,111 × 618,111
4. Step 4: Simplify right side
   287,118x = 382,061,208,321
5. Step 5: Solve for x
   x = 382,061,208,321/287,118
6. Step 6: Final answer
   x = 1,330,676.61