Finding the Fourth Proportional to 2,521.74, 3,784.32 and 878.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.74 : 3,784.32 = 878.28 : x
2. Step 2: Convert to fraction form
   2,521.74/3,784.32 = 878.28/x
3. Step 3: Cross multiply
   2,521.74x = 3,784.32 × 878.28
4. Step 4: Simplify right side
   2,521.74x = 3,323,692.57
5. Step 5: Solve for x
   x = 3,323,692.57/2,521.74
6. Step 6: Final answer
   x = 1,318.02