Finding the Fourth Proportional to 2,057.13, 2,839.23 and 1,172.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.13 : 2,839.23 = 1,172.79 : x
2. Step 2: Convert to fraction form
   2,057.13/2,839.23 = 1,172.79/x
3. Step 3: Cross multiply
   2,057.13x = 2,839.23 × 1,172.79
4. Step 4: Simplify right side
   2,057.13x = 3,329,820.55
5. Step 5: Solve for x
   x = 3,329,820.55/2,057.13
6. Step 6: Final answer
   x = 1,618.67