Finding the Fourth Proportional to 2,131.56, 3,197.79 and 1,590.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.56 : 3,197.79 = 1,590.21 : x
2. Step 2: Convert to fraction form
   2,131.56/3,197.79 = 1,590.21/x
3. Step 3: Cross multiply
   2,131.56x = 3,197.79 × 1,590.21
4. Step 4: Simplify right side
   2,131.56x = 5,085,157.64
5. Step 5: Solve for x
   x = 5,085,157.64/2,131.56
6. Step 6: Final answer
   x = 2,385.65