Finding the Fourth Proportional to 2,617.78, 3,926.69 and 887.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.78 : 3,926.69 = 887.62 : x
2. Step 2: Convert to fraction form
   2,617.78/3,926.69 = 887.62/x
3. Step 3: Cross multiply
   2,617.78x = 3,926.69 × 887.62
4. Step 4: Simplify right side
   2,617.78x = 3,485,408.58
5. Step 5: Solve for x
   x = 3,485,408.58/2,617.78
6. Step 6: Final answer
   x = 1,331.44