Finding the Fourth Proportional to 2,218.08, 3,320.69 and 1,290.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.08 : 3,320.69 = 1,290.81 : x
2. Step 2: Convert to fraction form
   2,218.08/3,320.69 = 1,290.81/x
3. Step 3: Cross multiply
   2,218.08x = 3,320.69 × 1,290.81
4. Step 4: Simplify right side
   2,218.08x = 4,286,373.40
5. Step 5: Solve for x
   x = 4,286,373.40/2,218.08
6. Step 6: Final answer
   x = 1,932.47