Finding the Third Proportional to 161,156 and 345,640

Step by Step Solution

1. Step 1: Write the proportion equation
   161,156 : 345,640 = 345,640 : x
2. Step 2: Convert to fraction form
   161,156/345,640 = 345,640/x
3. Step 3: Cross multiply
   161,156x = 345,640 × 345,640
4. Step 4: Simplify right side
   161,156x = 119,467,009,600
5. Step 5: Solve for x
   x = 119,467,009,600/161,156
6. Step 6: Final answer
   x = 741,312.82