Finding the Third Proportional to 811.69 and 1,719.56

Step by Step Solution

1. Step 1: Write the proportion equation
   811.69 : 1,719.56 = 1,719.56 : x
2. Step 2: Convert to fraction form
   811.69/1,719.56 = 1,719.56/x
3. Step 3: Cross multiply
   811.69x = 1,719.56 × 1,719.56
4. Step 4: Simplify right side
   811.69x = 2,956,895.19
5. Step 5: Solve for x
   x = 2,956,895.19/811.69
6. Step 6: Final answer
   x = 3,642.90