Finding the Third Proportional to 169,128 and 342,900

Step by Step Solution

1. Step 1: Write the proportion equation
   169,128 : 342,900 = 342,900 : x
2. Step 2: Convert to fraction form
   169,128/342,900 = 342,900/x
3. Step 3: Cross multiply
   169,128x = 342,900 × 342,900
4. Step 4: Simplify right side
   169,128x = 117,580,410,000
5. Step 5: Solve for x
   x = 117,580,410,000/169,128
6. Step 6: Final answer
   x = 695,215.52