Finding the Fourth Proportional to 2,087.57, 2,880.37 and 1,248.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.57 : 2,880.37 = 1,248.13 : x
2. Step 2: Convert to fraction form
   2,087.57/2,880.37 = 1,248.13/x
3. Step 3: Cross multiply
   2,087.57x = 2,880.37 × 1,248.13
4. Step 4: Simplify right side
   2,087.57x = 3,595,065.89
5. Step 5: Solve for x
   x = 3,595,065.89/2,087.57
6. Step 6: Final answer
   x = 1,722.13