Finding the Fourth Proportional to 2,086.53, 2,878.94 and 1,247.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.53 : 2,878.94 = 1,247.10 : x
2. Step 2: Convert to fraction form
   2,086.53/2,878.94 = 1,247.10/x
3. Step 3: Cross multiply
   2,086.53x = 2,878.94 × 1,247.10
4. Step 4: Simplify right side
   2,086.53x = 3,590,318.40
5. Step 5: Solve for x
   x = 3,590,318.40/2,086.53
6. Step 6: Final answer
   x = 1,720.71