Finding the Fourth Proportional to 2,086.90, 2,880.15 and 1,190.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.90 : 2,880.15 = 1,190.86 : x
2. Step 2: Convert to fraction form
   2,086.90/2,880.15 = 1,190.86/x
3. Step 3: Cross multiply
   2,086.90x = 2,880.15 × 1,190.86
4. Step 4: Simplify right side
   2,086.90x = 3,429,855.43
5. Step 5: Solve for x
   x = 3,429,855.43/2,086.90
6. Step 6: Final answer
   x = 1,643.52