Finding the Fourth Proportional to 2,087.16, 2,880.54 and 1,247.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.16 : 2,880.54 = 1,247.86 : x
2. Step 2: Convert to fraction form
   2,087.16/2,880.54 = 1,247.86/x
3. Step 3: Cross multiply
   2,087.16x = 2,880.54 × 1,247.86
4. Step 4: Simplify right side
   2,087.16x = 3,594,490.00
5. Step 5: Solve for x
   x = 3,594,490.00/2,087.16
6. Step 6: Final answer
   x = 1,722.19