Finding the Third Proportional to 2,688.19 and 3,618.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.19 : 3,618.42 = 3,618.42 : x
2. Step 2: Convert to fraction form
   2,688.19/3,618.42 = 3,618.42/x
3. Step 3: Cross multiply
   2,688.19x = 3,618.42 × 3,618.42
4. Step 4: Simplify right side
   2,688.19x = 13,092,976.87
5. Step 5: Solve for x
   x = 13,092,976.87/2,688.19
6. Step 6: Final answer
   x = 4,870.56