Finding the Third Proportional to 174,144 and 387,144

Step by Step Solution

1. Step 1: Write the proportion equation
   174,144 : 387,144 = 387,144 : x
2. Step 2: Convert to fraction form
   174,144/387,144 = 387,144/x
3. Step 3: Cross multiply
   174,144x = 387,144 × 387,144
4. Step 4: Simplify right side
   174,144x = 149,880,476,736
5. Step 5: Solve for x
   x = 149,880,476,736/174,144
6. Step 6: Final answer
   x = 860,669.77