Finding the Fourth Proportional to 2,520.22, 3,780.31 and 876.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.22 : 3,780.31 = 876.76 : x
2. Step 2: Convert to fraction form
   2,520.22/3,780.31 = 876.76/x
3. Step 3: Cross multiply
   2,520.22x = 3,780.31 × 876.76
4. Step 4: Simplify right side
   2,520.22x = 3,314,424.60
5. Step 5: Solve for x
   x = 3,314,424.60/2,520.22
6. Step 6: Final answer
   x = 1,315.13