Finding the Fourth Proportional to 3,638.16, 5,020.43 and 2,145.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,638.16 : 5,020.43 = 2,145.80 : x
2. Step 2: Convert to fraction form
   3,638.16/5,020.43 = 2,145.80/x
3. Step 3: Cross multiply
   3,638.16x = 5,020.43 × 2,145.80
4. Step 4: Simplify right side
   3,638.16x = 10,772,802.86
5. Step 5: Solve for x
   x = 10,772,802.86/3,638.16
6. Step 6: Final answer
   x = 2,961.06