Finding the Third Proportional to 86,290,387 and 185,387,846.50

Step by Step Solution

1. Step 1: Write the proportion equation
   86,290,387 : 185,387,846.50 = 185,387,846.50 : x
2. Step 2: Convert to fraction form
   86,290,387/185,387,846.50 = 185,387,846.50/x
3. Step 3: Cross multiply
   86,290,387x = 185,387,846.50 × 185,387,846.50
4. Step 4: Simplify right side
   86,290,387x = 34,368,653,629,907,564
5. Step 5: Solve for x
   x = 34,368,653,629,907,564/86,290,387
6. Step 6: Final answer
   x = 398,290,641.92