Finding the Third Proportional to 635,819,658 and 858,778,686

Step by Step Solution

1. Step 1: Write the proportion equation
   635,819,658 : 858,778,686 = 858,778,686 : x
2. Step 2: Convert to fraction form
   635,819,658/858,778,686 = 858,778,686/x
3. Step 3: Cross multiply
   635,819,658x = 858,778,686 × 858,778,686
4. Step 4: Simplify right side
   635,819,658x = 737,500,831,527,886,592
5. Step 5: Solve for x
   x = 737,500,831,527,886,592/635,819,658
6. Step 6: Final answer
   x = 1,159,921,405.78