Finding the Fourth Proportional to 2,109.12, 3,165.09 and 876.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.12 : 3,165.09 = 876.51 : x
2. Step 2: Convert to fraction form
   2,109.12/3,165.09 = 876.51/x
3. Step 3: Cross multiply
   2,109.12x = 3,165.09 × 876.51
4. Step 4: Simplify right side
   2,109.12x = 2,774,233.04
5. Step 5: Solve for x
   x = 2,774,233.04/2,109.12
6. Step 6: Final answer
   x = 1,315.35