Finding the Fourth Proportional to 2,105.76, 2,905.60 and 1,174.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.76 : 2,905.60 = 1,174.32 : x
2. Step 2: Convert to fraction form
   2,105.76/2,905.60 = 1,174.32/x
3. Step 3: Cross multiply
   2,105.76x = 2,905.60 × 1,174.32
4. Step 4: Simplify right side
   2,105.76x = 3,412,104.19
5. Step 5: Solve for x
   x = 3,412,104.19/2,105.76
6. Step 6: Final answer
   x = 1,620.37