Finding the Fourth Proportional to 2,058.96, 3,085.68 and 1,328.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,058.96 : 3,085.68 = 1,328.16 : x
2. Step 2: Convert to fraction form
   2,058.96/3,085.68 = 1,328.16/x
3. Step 3: Cross multiply
   2,058.96x = 3,085.68 × 1,328.16
4. Step 4: Simplify right side
   2,058.96x = 4,098,276.75
5. Step 5: Solve for x
   x = 4,098,276.75/2,058.96
6. Step 6: Final answer
   x = 1,990.46