Finding the Fourth Proportional to 2,158.21, 3,238.73 and 1,185

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.21 : 3,238.73 = 1,185 : x
2. Step 2: Convert to fraction form
   2,158.21/3,238.73 = 1,185/x
3. Step 3: Cross multiply
   2,158.21x = 3,238.73 × 1,185
4. Step 4: Simplify right side
   2,158.21x = 3,837,895.05
5. Step 5: Solve for x
   x = 3,837,895.05/2,158.21
6. Step 6: Final answer
   x = 1,778.28