Finding the Third Proportional to 100,776,978 and 221,079,492

Step by Step Solution

1. Step 1: Write the proportion equation
   100,776,978 : 221,079,492 = 221,079,492 : x
2. Step 2: Convert to fraction form
   100,776,978/221,079,492 = 221,079,492/x
3. Step 3: Cross multiply
   100,776,978x = 221,079,492 × 221,079,492
4. Step 4: Simplify right side
   100,776,978x = 48,876,141,782,978,064
5. Step 5: Solve for x
   x = 48,876,141,782,978,064/100,776,978
6. Step 6: Final answer
   x = 484,993,127.92