Finding the Fourth Proportional to 2,167.89, 2,990.28 and 1,328.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.89 : 2,990.28 = 1,328.30 : x
2. Step 2: Convert to fraction form
   2,167.89/2,990.28 = 1,328.30/x
3. Step 3: Cross multiply
   2,167.89x = 2,990.28 × 1,328.30
4. Step 4: Simplify right side
   2,167.89x = 3,971,973.97
5. Step 5: Solve for x
   x = 3,971,973.97/2,167.89
6. Step 6: Final answer
   x = 1,832.18