Finding the Fourth Proportional to 2,515.50, 3,773.29 and 872.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,515.50 : 3,773.29 = 872.09 : x
2. Step 2: Convert to fraction form
   2,515.50/3,773.29 = 872.09/x
3. Step 3: Cross multiply
   2,515.50x = 3,773.29 × 872.09
4. Step 4: Simplify right side
   2,515.50x = 3,290,648.48
5. Step 5: Solve for x
   x = 3,290,648.48/2,515.50
6. Step 6: Final answer
   x = 1,308.15