Finding the Fourth Proportional to 2,888.12, 4,331.71 and 1,328.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,888.12 : 4,331.71 = 1,328.06 : x
2. Step 2: Convert to fraction form
   2,888.12/4,331.71 = 1,328.06/x
3. Step 3: Cross multiply
   2,888.12x = 4,331.71 × 1,328.06
4. Step 4: Simplify right side
   2,888.12x = 5,752,783.27
5. Step 5: Solve for x
   x = 5,752,783.27/2,888.12
6. Step 6: Final answer
   x = 1,991.88