Finding the Third Proportional to 870.19 and 1,783.69

Step by Step Solution

1. Step 1: Write the proportion equation
   870.19 : 1,783.69 = 1,783.69 : x
2. Step 2: Convert to fraction form
   870.19/1,783.69 = 1,783.69/x
3. Step 3: Cross multiply
   870.19x = 1,783.69 × 1,783.69
4. Step 4: Simplify right side
   870.19x = 3,181,541.10
5. Step 5: Solve for x
   x = 3,181,541.10/870.19
6. Step 6: Final answer
   x = 3,656.16