Finding the Fourth Proportional to 2,185.88, 3,279.42 and 1,211.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.88 : 3,279.42 = 1,211.45 : x
2. Step 2: Convert to fraction form
   2,185.88/3,279.42 = 1,211.45/x
3. Step 3: Cross multiply
   2,185.88x = 3,279.42 × 1,211.45
4. Step 4: Simplify right side
   2,185.88x = 3,972,836.96
5. Step 5: Solve for x
   x = 3,972,836.96/2,185.88
6. Step 6: Final answer
   x = 1,817.50