Finding the Fourth Proportional to 2,057.16, 2,839.80 and 1,312.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.16 : 2,839.80 = 1,312.12 : x
2. Step 2: Convert to fraction form
   2,057.16/2,839.80 = 1,312.12/x
3. Step 3: Cross multiply
   2,057.16x = 2,839.80 × 1,312.12
4. Step 4: Simplify right side
   2,057.16x = 3,726,151.82
5. Step 5: Solve for x
   x = 3,726,151.82/2,057.16
6. Step 6: Final answer
   x = 1,811.31