Finding the Third Proportional to 139,804,978 and 209,707,485

Step by Step Solution

1. Step 1: Write the proportion equation
   139,804,978 : 209,707,485 = 209,707,485 : x
2. Step 2: Convert to fraction form
   139,804,978/209,707,485 = 209,707,485/x
3. Step 3: Cross multiply
   139,804,978x = 209,707,485 × 209,707,485
4. Step 4: Simplify right side
   139,804,978x = 43,977,229,265,025,224
5. Step 5: Solve for x
   x = 43,977,229,265,025,224/139,804,978
6. Step 6: Final answer
   x = 314,561,254.50