Finding the Fourth Proportional to 3,638.79, 5,020.79 and 2,145.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,638.79 : 5,020.79 = 2,145.96 : x
2. Step 2: Convert to fraction form
   3,638.79/5,020.79 = 2,145.96/x
3. Step 3: Cross multiply
   3,638.79x = 5,020.79 × 2,145.96
4. Step 4: Simplify right side
   3,638.79x = 10,774,403.78
5. Step 5: Solve for x
   x = 10,774,403.78/3,638.79
6. Step 6: Final answer
   x = 2,960.99