Finding the Third Proportional to 540,388 and 810,870

Step by Step Solution

1. Step 1: Write the proportion equation
   540,388 : 810,870 = 810,870 : x
2. Step 2: Convert to fraction form
   540,388/810,870 = 810,870/x
3. Step 3: Cross multiply
   540,388x = 810,870 × 810,870
4. Step 4: Simplify right side
   540,388x = 657,510,156,900
5. Step 5: Solve for x
   x = 657,510,156,900/540,388
6. Step 6: Final answer
   x = 1,216,737.15