Finding the Third Proportional to 64,721,878 and 139,048,816

Step by Step Solution

1. Step 1: Write the proportion equation
   64,721,878 : 139,048,816 = 139,048,816 : x
2. Step 2: Convert to fraction form
   64,721,878/139,048,816 = 139,048,816/x
3. Step 3: Cross multiply
   64,721,878x = 139,048,816 × 139,048,816
4. Step 4: Simplify right side
   64,721,878x = 19,334,573,231,001,856
5. Step 5: Solve for x
   x = 19,334,573,231,001,856/64,721,878
6. Step 6: Final answer
   x = 298,733,192.37