Finding the Fourth Proportional to 2,892.32, 3,991.92 and 2,105.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,892.32 : 3,991.92 = 2,105.36 : x
2. Step 2: Convert to fraction form
   2,892.32/3,991.92 = 2,105.36/x
3. Step 3: Cross multiply
   2,892.32x = 3,991.92 × 2,105.36
4. Step 4: Simplify right side
   2,892.32x = 8,404,428.69
5. Step 5: Solve for x
   x = 8,404,428.69/2,892.32
6. Step 6: Final answer
   x = 2,905.77