Finding the Fourth Proportional to 2,828.18, 4,224.40 and 2,390.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,828.18 : 4,224.40 = 2,390.78 : x
2. Step 2: Convert to fraction form
   2,828.18/4,224.40 = 2,390.78/x
3. Step 3: Cross multiply
   2,828.18x = 4,224.40 × 2,390.78
4. Step 4: Simplify right side
   2,828.18x = 10,099,611.03
5. Step 5: Solve for x
   x = 10,099,611.03/2,828.18
6. Step 6: Final answer
   x = 3,571.06