Finding the Third Proportional to 638,144 and 987,986

Step by Step Solution

1. Step 1: Write the proportion equation
   638,144 : 987,986 = 987,986 : x
2. Step 2: Convert to fraction form
   638,144/987,986 = 987,986/x
3. Step 3: Cross multiply
   638,144x = 987,986 × 987,986
4. Step 4: Simplify right side
   638,144x = 976,116,336,196
5. Step 5: Solve for x
   x = 976,116,336,196/638,144
6. Step 6: Final answer
   x = 1,529,617.67