Finding the Fourth Proportional to 2,086.81, 2,880.12 and 1,190.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.81 : 2,880.12 = 1,190.55 : x
2. Step 2: Convert to fraction form
   2,086.81/2,880.12 = 1,190.55/x
3. Step 3: Cross multiply
   2,086.81x = 2,880.12 × 1,190.55
4. Step 4: Simplify right side
   2,086.81x = 3,428,926.87
5. Step 5: Solve for x
   x = 3,428,926.87/2,086.81
6. Step 6: Final answer
   x = 1,643.14