Finding the Third Proportional to 1,687.75 and 3,558.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.75 : 3,558.88 = 3,558.88 : x
2. Step 2: Convert to fraction form
   1,687.75/3,558.88 = 3,558.88/x
3. Step 3: Cross multiply
   1,687.75x = 3,558.88 × 3,558.88
4. Step 4: Simplify right side
   1,687.75x = 12,665,591.27
5. Step 5: Solve for x
   x = 12,665,591.27/1,687.75
6. Step 6: Final answer
   x = 7,504.42