Finding the Fourth Proportional to 2,580.10, 3,870.18 and 1,099.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.10 : 3,870.18 = 1,099.12 : x
2. Step 2: Convert to fraction form
   2,580.10/3,870.18 = 1,099.12/x
3. Step 3: Cross multiply
   2,580.10x = 3,870.18 × 1,099.12
4. Step 4: Simplify right side
   2,580.10x = 4,253,792.24
5. Step 5: Solve for x
   x = 4,253,792.24/2,580.10
6. Step 6: Final answer
   x = 1,648.69