Finding the Third Proportional to 31,399,864,738 and 63,722,398,532

Step by Step Solution

1. Step 1: Write the proportion equation
   31,399,864,738 : 63,722,398,532 = 63,722,398,532 : x
2. Step 2: Convert to fraction form
   31,399,864,738/63,722,398,532 = 63,722,398,532/x
3. Step 3: Cross multiply
   31,399,864,738x = 63,722,398,532 × 63,722,398,532
4. Step 4: Simplify right side
   31,399,864,738x = 4,060,544,074,671,035,777,024
5. Step 5: Solve for x
   x = 4,060,544,074,671,035,777,024/31,399,864,738
6. Step 6: Final answer
   x = 129,317,247,336.96