Finding the Third Proportional to 123,940 and 189,630

Step by Step Solution

1. Step 1: Write the proportion equation
   123,940 : 189,630 = 189,630 : x
2. Step 2: Convert to fraction form
   123,940/189,630 = 189,630/x
3. Step 3: Cross multiply
   123,940x = 189,630 × 189,630
4. Step 4: Simplify right side
   123,940x = 35,959,536,900
5. Step 5: Solve for x
   x = 35,959,536,900/123,940
6. Step 6: Final answer
   x = 290,136.65