Finding the Third Proportional to 1,315.13 and 1,783.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.13 : 1,783.69 = 1,783.69 : x
2. Step 2: Convert to fraction form
   1,315.13/1,783.69 = 1,783.69/x
3. Step 3: Cross multiply
   1,315.13x = 1,783.69 × 1,783.69
4. Step 4: Simplify right side
   1,315.13x = 3,181,541.10
5. Step 5: Solve for x
   x = 3,181,541.10/1,315.13
6. Step 6: Final answer
   x = 2,419.19