Finding the Fourth Proportional to 2,580.56, 3,561.48 and 1,533.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.56 : 3,561.48 = 1,533.20 : x
2. Step 2: Convert to fraction form
   2,580.56/3,561.48 = 1,533.20/x
3. Step 3: Cross multiply
   2,580.56x = 3,561.48 × 1,533.20
4. Step 4: Simplify right side
   2,580.56x = 5,460,461.14
5. Step 5: Solve for x
   x = 5,460,461.14/2,580.56
6. Step 6: Final answer
   x = 2,116.00