Finding the Fourth Proportional to 2,191.98, 3,289.18 and 1,218.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.98 : 3,289.18 = 1,218.62 : x
2. Step 2: Convert to fraction form
   2,191.98/3,289.18 = 1,218.62/x
3. Step 3: Cross multiply
   2,191.98x = 3,289.18 × 1,218.62
4. Step 4: Simplify right side
   2,191.98x = 4,008,260.53
5. Step 5: Solve for x
   x = 4,008,260.53/2,191.98
6. Step 6: Final answer
   x = 1,828.60