Finding the Fourth Proportional to 2,630.82, 3,964.34 and 2,178.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.82 : 3,964.34 = 2,178.78 : x
2. Step 2: Convert to fraction form
   2,630.82/3,964.34 = 2,178.78/x
3. Step 3: Cross multiply
   2,630.82x = 3,964.34 × 2,178.78
4. Step 4: Simplify right side
   2,630.82x = 8,637,424.71
5. Step 5: Solve for x
   x = 8,637,424.71/2,630.82
6. Step 6: Final answer
   x = 3,283.17