Finding the Fourth Proportional to 2,878.22, 3,970.59 and 1,815.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,878.22 : 3,970.59 = 1,815.50 : x
2. Step 2: Convert to fraction form
   2,878.22/3,970.59 = 1,815.50/x
3. Step 3: Cross multiply
   2,878.22x = 3,970.59 × 1,815.50
4. Step 4: Simplify right side
   2,878.22x = 7,208,586.29
5. Step 5: Solve for x
   x = 7,208,586.29/2,878.22
6. Step 6: Final answer
   x = 2,504.53