Finding the Fourth Proportional to 2,113.46, 3,168.38 and 815.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.46 : 3,168.38 = 815.84 : x
2. Step 2: Convert to fraction form
   2,113.46/3,168.38 = 815.84/x
3. Step 3: Cross multiply
   2,113.46x = 3,168.38 × 815.84
4. Step 4: Simplify right side
   2,113.46x = 2,584,891.14
5. Step 5: Solve for x
   x = 2,584,891.14/2,113.46
6. Step 6: Final answer
   x = 1,223.06