Finding the Fourth Proportional to 2,580.72, 3,561.68 and 1,636.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.72 : 3,561.68 = 1,636.80 : x
2. Step 2: Convert to fraction form
   2,580.72/3,561.68 = 1,636.80/x
3. Step 3: Cross multiply
   2,580.72x = 3,561.68 × 1,636.80
4. Step 4: Simplify right side
   2,580.72x = 5,829,757.82
5. Step 5: Solve for x
   x = 5,829,757.82/2,580.72
6. Step 6: Final answer
   x = 2,258.97