Finding the Fourth Proportional to 2,057.31, 3,085.20 and 1,276.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.31 : 3,085.20 = 1,276.16 : x
2. Step 2: Convert to fraction form
   2,057.31/3,085.20 = 1,276.16/x
3. Step 3: Cross multiply
   2,057.31x = 3,085.20 × 1,276.16
4. Step 4: Simplify right side
   2,057.31x = 3,937,193.41
5. Step 5: Solve for x
   x = 3,937,193.41/2,057.31
6. Step 6: Final answer
   x = 1,913.76