Finding the Third Proportional to 643,336,911 and 1,404,654,543

Step by Step Solution

1. Step 1: Write the proportion equation
   643,336,911 : 1,404,654,543 = 1,404,654,543 : x
2. Step 2: Convert to fraction form
   643,336,911/1,404,654,543 = 1,404,654,543/x
3. Step 3: Cross multiply
   643,336,911x = 1,404,654,543 × 1,404,654,543
4. Step 4: Simplify right side
   643,336,911x = 1,973,054,385,170,538,752
5. Step 5: Solve for x
   x = 1,973,054,385,170,538,752/643,336,911
6. Step 6: Final answer
   x = 3,066,906,859.27