Finding the Fourth Proportional to 2,178.30, 3,265.47 and 878.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.30 : 3,265.47 = 878.88 : x
2. Step 2: Convert to fraction form
   2,178.30/3,265.47 = 878.88/x
3. Step 3: Cross multiply
   2,178.30x = 3,265.47 × 878.88
4. Step 4: Simplify right side
   2,178.30x = 2,869,956.27
5. Step 5: Solve for x
   x = 2,869,956.27/2,178.30
6. Step 6: Final answer
   x = 1,317.52