Finding the Fourth Proportional to 2,087.37, 2,880.54 and 1,191.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.37 : 2,880.54 = 1,191.09 : x
2. Step 2: Convert to fraction form
   2,087.37/2,880.54 = 1,191.09/x
3. Step 3: Cross multiply
   2,087.37x = 2,880.54 × 1,191.09
4. Step 4: Simplify right side
   2,087.37x = 3,430,975.10
5. Step 5: Solve for x
   x = 3,430,975.10/2,087.37
6. Step 6: Final answer
   x = 1,643.68