Finding the Third Proportional to 321,156 and 500,118

Step by Step Solution

1. Step 1: Write the proportion equation
   321,156 : 500,118 = 500,118 : x
2. Step 2: Convert to fraction form
   321,156/500,118 = 500,118/x
3. Step 3: Cross multiply
   321,156x = 500,118 × 500,118
4. Step 4: Simplify right side
   321,156x = 250,118,013,924
5. Step 5: Solve for x
   x = 250,118,013,924/321,156
6. Step 6: Final answer
   x = 778,805.36