Finding the Third Proportional to 638,431,096 and 898,659,890

Step by Step Solution

1. Step 1: Write the proportion equation
   638,431,096 : 898,659,890 = 898,659,890 : x
2. Step 2: Convert to fraction form
   638,431,096/898,659,890 = 898,659,890/x
3. Step 3: Cross multiply
   638,431,096x = 898,659,890 × 898,659,890
4. Step 4: Simplify right side
   638,431,096x = 807,589,597,894,812,160
5. Step 5: Solve for x
   x = 807,589,597,894,812,160/638,431,096
6. Step 6: Final answer
   x = 1,264,959,684.69