Finding the Third Proportional to 147,310 and 320,870

Step by Step Solution

1. Step 1: Write the proportion equation
   147,310 : 320,870 = 320,870 : x
2. Step 2: Convert to fraction form
   147,310/320,870 = 320,870/x
3. Step 3: Cross multiply
   147,310x = 320,870 × 320,870
4. Step 4: Simplify right side
   147,310x = 102,957,556,900
5. Step 5: Solve for x
   x = 102,957,556,900/147,310
6. Step 6: Final answer
   x = 698,917.64