Finding the Fourth Proportional to 2,802.66, 3,870.78 and 2,180.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,802.66 : 3,870.78 = 2,180.72 : x
2. Step 2: Convert to fraction form
   2,802.66/3,870.78 = 2,180.72/x
3. Step 3: Cross multiply
   2,802.66x = 3,870.78 × 2,180.72
4. Step 4: Simplify right side
   2,802.66x = 8,441,087.36
5. Step 5: Solve for x
   x = 8,441,087.36/2,802.66
6. Step 6: Final answer
   x = 3,011.81