Finding the Fourth Proportional to 2,215.80, 3,321.14 and 1,590.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.80 : 3,321.14 = 1,590.39 : x
2. Step 2: Convert to fraction form
   2,215.80/3,321.14 = 1,590.39/x
3. Step 3: Cross multiply
   2,215.80x = 3,321.14 × 1,590.39
4. Step 4: Simplify right side
   2,215.80x = 5,281,899.89
5. Step 5: Solve for x
   x = 5,281,899.89/2,215.80
6. Step 6: Final answer
   x = 2,383.74