Finding the Fourth Proportional to 2,084.24, 2,876.78 and 1,288.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.24 : 2,876.78 = 1,288.25 : x
2. Step 2: Convert to fraction form
   2,084.24/2,876.78 = 1,288.25/x
3. Step 3: Cross multiply
   2,084.24x = 2,876.78 × 1,288.25
4. Step 4: Simplify right side
   2,084.24x = 3,706,011.46
5. Step 5: Solve for x
   x = 3,706,011.46/2,084.24
6. Step 6: Final answer
   x = 1,778.11