Finding the Fourth Proportional to 2,057.61, 2,839.56 and 1,173.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.61 : 2,839.56 = 1,173.39 : x
2. Step 2: Convert to fraction form
   2,057.61/2,839.56 = 1,173.39/x
3. Step 3: Cross multiply
   2,057.61x = 2,839.56 × 1,173.39
4. Step 4: Simplify right side
   2,057.61x = 3,331,911.31
5. Step 5: Solve for x
   x = 3,331,911.31/2,057.61
6. Step 6: Final answer
   x = 1,619.31