Finding the Fourth Proportional to 2,521.59, 3,783 and 878.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.59 : 3,783 = 878.15 : x
2. Step 2: Convert to fraction form
   2,521.59/3,783 = 878.15/x
3. Step 3: Cross multiply
   2,521.59x = 3,783 × 878.15
4. Step 4: Simplify right side
   2,521.59x = 3,322,041.45
5. Step 5: Solve for x
   x = 3,322,041.45/2,521.59
6. Step 6: Final answer
   x = 1,317.44