Finding the Third Proportional to 139,291,605 and 209,288,407.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,291,605 : 209,288,407.50 = 209,288,407.50 : x
2. Step 2: Convert to fraction form
   139,291,605/209,288,407.50 = 209,288,407.50/x
3. Step 3: Cross multiply
   139,291,605x = 209,288,407.50 × 209,288,407.50
4. Step 4: Simplify right side
   139,291,605x = 43,801,637,513,886,056
5. Step 5: Solve for x
   x = 43,801,637,513,886,056/139,291,605
6. Step 6: Final answer
   x = 314,459,995.73