Finding the Third Proportional to 339.47 and 540.56

Step by Step Solution

1. Step 1: Write the proportion equation
   339.47 : 540.56 = 540.56 : x
2. Step 2: Convert to fraction form
   339.47/540.56 = 540.56/x
3. Step 3: Cross multiply
   339.47x = 540.56 × 540.56
4. Step 4: Simplify right side
   339.47x = 292,207.82
5. Step 5: Solve for x
   x = 292,207.82/339.47
6. Step 6: Final answer
   x = 860.78