Finding the Third Proportional to 90,108,990 and 139,590,669

Step by Step Solution

1. Step 1: Write the proportion equation
   90,108,990 : 139,590,669 = 139,590,669 : x
2. Step 2: Convert to fraction form
   90,108,990/139,590,669 = 139,590,669/x
3. Step 3: Cross multiply
   90,108,990x = 139,590,669 × 139,590,669
4. Step 4: Simplify right side
   90,108,990x = 19,485,554,871,867,560
5. Step 5: Solve for x
   x = 19,485,554,871,867,560/90,108,990
6. Step 6: Final answer
   x = 216,244,293.40