Finding the Fourth Proportional to 2,185, 3,279.12 and 1,210.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185 : 3,279.12 = 1,210.12 : x
2. Step 2: Convert to fraction form
   2,185/3,279.12 = 1,210.12/x
3. Step 3: Cross multiply
   2,185x = 3,279.12 × 1,210.12
4. Step 4: Simplify right side
   2,185x = 3,968,128.69
5. Step 5: Solve for x
   x = 3,968,128.69/2,185
6. Step 6: Final answer
   x = 1,816.08