Finding the Third Proportional to 18,965,559,468 and 42,171,518,520

Step by Step Solution

1. Step 1: Write the proportion equation
   18,965,559,468 : 42,171,518,520 = 42,171,518,520 : x
2. Step 2: Convert to fraction form
   18,965,559,468/42,171,518,520 = 42,171,518,520/x
3. Step 3: Cross multiply
   18,965,559,468x = 42,171,518,520 × 42,171,518,520
4. Step 4: Simplify right side
   18,965,559,468x = 1,778,436,974,282,703,110,144
5. Step 5: Solve for x
   x = 1,778,436,974,282,703,110,144/18,965,559,468
6. Step 6: Final answer
   x = 93,771,922,588.60