Finding the Fourth Proportional to 2,520.16, 3,780.57 and 876.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.16 : 3,780.57 = 876.83 : x
2. Step 2: Convert to fraction form
   2,520.16/3,780.57 = 876.83/x
3. Step 3: Cross multiply
   2,520.16x = 3,780.57 × 876.83
4. Step 4: Simplify right side
   2,520.16x = 3,314,917.19
5. Step 5: Solve for x
   x = 3,314,917.19/2,520.16
6. Step 6: Final answer
   x = 1,315.36