Finding the Third Proportional to 31,139,503,878 and 64,486,536,396

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139,503,878 : 64,486,536,396 = 64,486,536,396 : x
2. Step 2: Convert to fraction form
   31,139,503,878/64,486,536,396 = 64,486,536,396/x
3. Step 3: Cross multiply
   31,139,503,878x = 64,486,536,396 × 64,486,536,396
4. Step 4: Simplify right side
   31,139,503,878x = 4,158,513,376,352,632,569,856
5. Step 5: Solve for x
   x = 4,158,513,376,352,632,569,856/31,139,503,878
6. Step 6: Final answer
   x = 133,544,625,265.87