Finding the Fourth Proportional to 2,057.54, 2,840.33 and 1,312.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.54 : 2,840.33 = 1,312.49 : x
2. Step 2: Convert to fraction form
   2,057.54/2,840.33 = 1,312.49/x
3. Step 3: Cross multiply
   2,057.54x = 2,840.33 × 1,312.49
4. Step 4: Simplify right side
   2,057.54x = 3,727,904.72
5. Step 5: Solve for x
   x = 3,727,904.72/2,057.54
6. Step 6: Final answer
   x = 1,811.83