Finding the Fourth Proportional to 2,605.72, 3,908.60 and 875.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.72 : 3,908.60 = 875.56 : x
2. Step 2: Convert to fraction form
   2,605.72/3,908.60 = 875.56/x
3. Step 3: Cross multiply
   2,605.72x = 3,908.60 × 875.56
4. Step 4: Simplify right side
   2,605.72x = 3,422,213.82
5. Step 5: Solve for x
   x = 3,422,213.82/2,605.72
6. Step 6: Final answer
   x = 1,313.35