Finding the Fourth Proportional to 2,515.56, 3,773.38 and 872.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,515.56 : 3,773.38 = 872.16 : x
2. Step 2: Convert to fraction form
   2,515.56/3,773.38 = 872.16/x
3. Step 3: Cross multiply
   2,515.56x = 3,773.38 × 872.16
4. Step 4: Simplify right side
   2,515.56x = 3,290,991.10
5. Step 5: Solve for x
   x = 3,290,991.10/2,515.56
6. Step 6: Final answer
   x = 1,308.25