Finding the Fourth Proportional to 2,145.06, 3,213.90 and 1,171.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.06 : 3,213.90 = 1,171.83 : x
2. Step 2: Convert to fraction form
   2,145.06/3,213.90 = 1,171.83/x
3. Step 3: Cross multiply
   2,145.06x = 3,213.90 × 1,171.83
4. Step 4: Simplify right side
   2,145.06x = 3,766,144.44
5. Step 5: Solve for x
   x = 3,766,144.44/2,145.06
6. Step 6: Final answer
   x = 1,755.73