Finding the Fourth Proportional to 2,086.29, 2,878.99 and 1,247.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.29 : 2,878.99 = 1,247.45 : x
2. Step 2: Convert to fraction form
   2,086.29/2,878.99 = 1,247.45/x
3. Step 3: Cross multiply
   2,086.29x = 2,878.99 × 1,247.45
4. Step 4: Simplify right side
   2,086.29x = 3,591,389.84
5. Step 5: Solve for x
   x = 3,591,389.84/2,086.29
6. Step 6: Final answer
   x = 1,721.43