Finding the Third Proportional to 2,085.55 and 4,228.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.55 : 4,228.77 = 4,228.77 : x
2. Step 2: Convert to fraction form
   2,085.55/4,228.77 = 4,228.77/x
3. Step 3: Cross multiply
   2,085.55x = 4,228.77 × 4,228.77
4. Step 4: Simplify right side
   2,085.55x = 17,882,491.75
5. Step 5: Solve for x
   x = 17,882,491.75/2,085.55
6. Step 6: Final answer
   x = 8,574.46