Finding the Fourth Proportional to 2,105.31, 2,905.33 and 1,173.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.31 : 2,905.33 = 1,173.81 : x
2. Step 2: Convert to fraction form
   2,105.31/2,905.33 = 1,173.81/x
3. Step 3: Cross multiply
   2,105.31x = 2,905.33 × 1,173.81
4. Step 4: Simplify right side
   2,105.31x = 3,410,305.41
5. Step 5: Solve for x
   x = 3,410,305.41/2,105.31
6. Step 6: Final answer
   x = 1,619.86