Finding the Fourth Proportional to 2,521.70, 3,783.06 and 878.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.70 : 3,783.06 = 878.38 : x
2. Step 2: Convert to fraction form
   2,521.70/3,783.06 = 878.38/x
3. Step 3: Cross multiply
   2,521.70x = 3,783.06 × 878.38
4. Step 4: Simplify right side
   2,521.70x = 3,322,947.52
5. Step 5: Solve for x
   x = 3,322,947.52/2,521.70
6. Step 6: Final answer
   x = 1,317.74