Finding the Fourth Proportional to 2,618.82, 3,928.94 and 887.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.82 : 3,928.94 = 887.45 : x
2. Step 2: Convert to fraction form
   2,618.82/3,928.94 = 887.45/x
3. Step 3: Cross multiply
   2,618.82x = 3,928.94 × 887.45
4. Step 4: Simplify right side
   2,618.82x = 3,486,713.72
5. Step 5: Solve for x
   x = 3,486,713.72/2,618.82
6. Step 6: Final answer
   x = 1,331.41