Finding the Third Proportional to 31,139,503,876 and 64,486,536,392

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139,503,876 : 64,486,536,392 = 64,486,536,392 : x
2. Step 2: Convert to fraction form
   31,139,503,876/64,486,536,392 = 64,486,536,392/x
3. Step 3: Cross multiply
   31,139,503,876x = 64,486,536,392 × 64,486,536,392
4. Step 4: Simplify right side
   31,139,503,876x = 4,158,513,375,836,740,517,888
5. Step 5: Solve for x
   x = 4,158,513,375,836,740,517,888/31,139,503,876
6. Step 6: Final answer
   x = 133,544,625,257.88