Finding the Third Proportional to 1,556.72 and 3,405.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.72 : 3,405.80 = 3,405.80 : x
2. Step 2: Convert to fraction form
   1,556.72/3,405.80 = 3,405.80/x
3. Step 3: Cross multiply
   1,556.72x = 3,405.80 × 3,405.80
4. Step 4: Simplify right side
   1,556.72x = 11,599,452.35
5. Step 5: Solve for x
   x = 11,599,452.35/1,556.72
6. Step 6: Final answer
   x = 7,451.22