Finding the Fourth Proportional to 2,830.40, 4,222.89 and 2,518.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,830.40 : 4,222.89 = 2,518.55 : x
2. Step 2: Convert to fraction form
   2,830.40/4,222.89 = 2,518.55/x
3. Step 3: Cross multiply
   2,830.40x = 4,222.89 × 2,518.55
4. Step 4: Simplify right side
   2,830.40x = 10,635,547.02
5. Step 5: Solve for x
   x = 10,635,547.02/2,830.40
6. Step 6: Final answer
   x = 3,757.61