Finding the Third Proportional to 856.13 and 1,621.69

Step by Step Solution

1. Step 1: Write the proportion equation
   856.13 : 1,621.69 = 1,621.69 : x
2. Step 2: Convert to fraction form
   856.13/1,621.69 = 1,621.69/x
3. Step 3: Cross multiply
   856.13x = 1,621.69 × 1,621.69
4. Step 4: Simplify right side
   856.13x = 2,629,870.35
5. Step 5: Solve for x
   x = 2,629,870.35/856.13
6. Step 6: Final answer
   x = 3,071.83