Finding the Third Proportional to 342.56 and 556.56

Step by Step Solution

1. Step 1: Write the proportion equation
   342.56 : 556.56 = 556.56 : x
2. Step 2: Convert to fraction form
   342.56/556.56 = 556.56/x
3. Step 3: Cross multiply
   342.56x = 556.56 × 556.56
4. Step 4: Simplify right side
   342.56x = 309,761.82
5. Step 5: Solve for x
   x = 309,761.82/342.56
6. Step 6: Final answer
   x = 904.25