Finding the Third Proportional to 221,818 and 313,870

Step by Step Solution

1. Step 1: Write the proportion equation
   221,818 : 313,870 = 313,870 : x
2. Step 2: Convert to fraction form
   221,818/313,870 = 313,870/x
3. Step 3: Cross multiply
   221,818x = 313,870 × 313,870
4. Step 4: Simplify right side
   221,818x = 98,514,376,900
5. Step 5: Solve for x
   x = 98,514,376,900/221,818
6. Step 6: Final answer
   x = 444,122.55