Finding the Third Proportional to 309,139,672.13 and 666,705,536.25

Step by Step Solution

1. Step 1: Write the proportion equation
   309,139,672.13 : 666,705,536.25 = 666,705,536.25 : x
2. Step 2: Convert to fraction form
   309,139,672.13/666,705,536.25 = 666,705,536.25/x
3. Step 3: Cross multiply
   309,139,672.13x = 666,705,536.25 × 666,705,536.25
4. Step 4: Simplify right side
   309,139,672.13x = 444,496,272,066,400,064
5. Step 5: Solve for x
   x = 444,496,272,066,400,064/309,139,672.13
6. Step 6: Final answer
   x = 1,437,849,335.26