Finding the Third Proportional to 510.28 and 1,111.69

Step by Step Solution

1. Step 1: Write the proportion equation
   510.28 : 1,111.69 = 1,111.69 : x
2. Step 2: Convert to fraction form
   510.28/1,111.69 = 1,111.69/x
3. Step 3: Cross multiply
   510.28x = 1,111.69 × 1,111.69
4. Step 4: Simplify right side
   510.28x = 1,235,849.10
5. Step 5: Solve for x
   x = 1,235,849.10/510.28
6. Step 6: Final answer
   x = 2,421.90