Finding the Fourth Proportional to 2,113.05, 3,168.87 and 726.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.05 : 3,168.87 = 726.35 : x
2. Step 2: Convert to fraction form
   2,113.05/3,168.87 = 726.35/x
3. Step 3: Cross multiply
   2,113.05x = 3,168.87 × 726.35
4. Step 4: Simplify right side
   2,113.05x = 2,301,708.72
5. Step 5: Solve for x
   x = 2,301,708.72/2,113.05
6. Step 6: Final answer
   x = 1,089.28