Finding the Third Proportional to 320,548 and 480,870

Step by Step Solution

1. Step 1: Write the proportion equation
   320,548 : 480,870 = 480,870 : x
2. Step 2: Convert to fraction form
   320,548/480,870 = 480,870/x
3. Step 3: Cross multiply
   320,548x = 480,870 × 480,870
4. Step 4: Simplify right side
   320,548x = 231,235,956,900
5. Step 5: Solve for x
   x = 231,235,956,900/320,548
6. Step 6: Final answer
   x = 721,377.01