Finding the Fourth Proportional to 2,086.59, 2,880.06 and 1,378.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.59 : 2,880.06 = 1,378.53 : x
2. Step 2: Convert to fraction form
   2,086.59/2,880.06 = 1,378.53/x
3. Step 3: Cross multiply
   2,086.59x = 2,880.06 × 1,378.53
4. Step 4: Simplify right side
   2,086.59x = 3,970,249.11
5. Step 5: Solve for x
   x = 3,970,249.11/2,086.59
6. Step 6: Final answer
   x = 1,902.75