Finding the Third Proportional to 555.61 and 810.56

Step by Step Solution

1. Step 1: Write the proportion equation
   555.61 : 810.56 = 810.56 : x
2. Step 2: Convert to fraction form
   555.61/810.56 = 810.56/x
3. Step 3: Cross multiply
   555.61x = 810.56 × 810.56
4. Step 4: Simplify right side
   555.61x = 657,011.57
5. Step 5: Solve for x
   x = 657,011.57/555.61
6. Step 6: Final answer
   x = 1,182.51