Finding the Third Proportional to 810.56 and 1,200.38

Step by Step Solution

1. Step 1: Write the proportion equation
   810.56 : 1,200.38 = 1,200.38 : x
2. Step 2: Convert to fraction form
   810.56/1,200.38 = 1,200.38/x
3. Step 3: Cross multiply
   810.56x = 1,200.38 × 1,200.38
4. Step 4: Simplify right side
   810.56x = 1,440,900.14
5. Step 5: Solve for x
   x = 1,440,900.14/810.56
6. Step 6: Final answer
   x = 1,777.65