Finding the Fourth Proportional to 2,057.16, 2,838.72 and 1,172.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.16 : 2,838.72 = 1,172.79 : x
2. Step 2: Convert to fraction form
   2,057.16/2,838.72 = 1,172.79/x
3. Step 3: Cross multiply
   2,057.16x = 2,838.72 × 1,172.79
4. Step 4: Simplify right side
   2,057.16x = 3,329,222.43
5. Step 5: Solve for x
   x = 3,329,222.43/2,057.16
6. Step 6: Final answer
   x = 1,618.36