Finding the Third Proportional to 369,487 and 555,870

Step by Step Solution

1. Step 1: Write the proportion equation
   369,487 : 555,870 = 555,870 : x
2. Step 2: Convert to fraction form
   369,487/555,870 = 555,870/x
3. Step 3: Cross multiply
   369,487x = 555,870 × 555,870
4. Step 4: Simplify right side
   369,487x = 308,991,456,900
5. Step 5: Solve for x
   x = 308,991,456,900/369,487
6. Step 6: Final answer
   x = 836,271.52