Finding the Fourth Proportional to 2,167.56, 2,990.82 and 1,328.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.56 : 2,990.82 = 1,328.40 : x
2. Step 2: Convert to fraction form
   2,167.56/2,990.82 = 1,328.40/x
3. Step 3: Cross multiply
   2,167.56x = 2,990.82 × 1,328.40
4. Step 4: Simplify right side
   2,167.56x = 3,973,010.27
5. Step 5: Solve for x
   x = 3,973,010.27/2,167.56
6. Step 6: Final answer
   x = 1,832.94