Finding the Third Proportional to 129.56 and 336.56

Step by Step Solution

1. Step 1: Write the proportion equation
   129.56 : 336.56 = 336.56 : x
2. Step 2: Convert to fraction form
   129.56/336.56 = 336.56/x
3. Step 3: Cross multiply
   129.56x = 336.56 × 336.56
4. Step 4: Simplify right side
   129.56x = 113,274.32
5. Step 5: Solve for x
   x = 113,274.32/129.56
6. Step 6: Final answer
   x = 874.28