Finding the Third Proportional to 638,147 and 987,992.50

Step by Step Solution

1. Step 1: Write the proportion equation
   638,147 : 987,992.50 = 987,992.50 : x
2. Step 2: Convert to fraction form
   638,147/987,992.50 = 987,992.50/x
3. Step 3: Cross multiply
   638,147x = 987,992.50 × 987,992.50
4. Step 4: Simplify right side
   638,147x = 976,129,180,056.25
5. Step 5: Solve for x
   x = 976,129,180,056.25/638,147
6. Step 6: Final answer
   x = 1,529,630.60