Finding the Fourth Proportional to 2,131.62, 3,190.83 and 1,155.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.62 : 3,190.83 = 1,155.30 : x
2. Step 2: Convert to fraction form
   2,131.62/3,190.83 = 1,155.30/x
3. Step 3: Cross multiply
   2,131.62x = 3,190.83 × 1,155.30
4. Step 4: Simplify right side
   2,131.62x = 3,686,365.90
5. Step 5: Solve for x
   x = 3,686,365.90/2,131.62
6. Step 6: Final answer
   x = 1,729.37