Finding the Fourth Proportional to 2,057.91, 2,839.80 and 1,173.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.91 : 2,839.80 = 1,173.79 : x
2. Step 2: Convert to fraction form
   2,057.91/2,839.80 = 1,173.79/x
3. Step 3: Cross multiply
   2,057.91x = 2,839.80 × 1,173.79
4. Step 4: Simplify right side
   2,057.91x = 3,333,328.84
5. Step 5: Solve for x
   x = 3,333,328.84/2,057.91
6. Step 6: Final answer
   x = 1,619.76