Finding the Third Proportional to 139,804,981 and 209,707,489.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,804,981 : 209,707,489.50 = 209,707,489.50 : x
2. Step 2: Convert to fraction form
   139,804,981/209,707,489.50 = 209,707,489.50/x
3. Step 3: Cross multiply
   139,804,981x = 209,707,489.50 × 209,707,489.50
4. Step 4: Simplify right side
   139,804,981x = 43,977,231,152,392,608
5. Step 5: Solve for x
   x = 43,977,231,152,392,608/139,804,981
6. Step 6: Final answer
   x = 314,561,261.25