Finding the Fourth Proportional to 2,113.89, 2,918.19 and 1,328.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.89 : 2,918.19 = 1,328.32 : x
2. Step 2: Convert to fraction form
   2,113.89/2,918.19 = 1,328.32/x
3. Step 3: Cross multiply
   2,113.89x = 2,918.19 × 1,328.32
4. Step 4: Simplify right side
   2,113.89x = 3,876,290.14
5. Step 5: Solve for x
   x = 3,876,290.14/2,113.89
6. Step 6: Final answer
   x = 1,833.72