Finding the Third Proportional to 158,643 and 345,690

Step by Step Solution

1. Step 1: Write the proportion equation
   158,643 : 345,690 = 345,690 : x
2. Step 2: Convert to fraction form
   158,643/345,690 = 345,690/x
3. Step 3: Cross multiply
   158,643x = 345,690 × 345,690
4. Step 4: Simplify right side
   158,643x = 119,501,576,100
5. Step 5: Solve for x
   x = 119,501,576,100/158,643
6. Step 6: Final answer
   x = 753,273.55