Finding the Third Proportional to 64,718,838 and 139,042,978

Step by Step Solution

1. Step 1: Write the proportion equation
   64,718,838 : 139,042,978 = 139,042,978 : x
2. Step 2: Convert to fraction form
   64,718,838/139,042,978 = 139,042,978/x
3. Step 3: Cross multiply
   64,718,838x = 139,042,978 × 139,042,978
4. Step 4: Simplify right side
   64,718,838x = 19,332,949,731,108,484
5. Step 5: Solve for x
   x = 19,332,949,731,108,484/64,718,838
6. Step 6: Final answer
   x = 298,722,139.16