Finding the Fourth Proportional to 1,803.65, 2,488.59 and 1,057.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,803.65 : 2,488.59 = 1,057.64 : x
2. Step 2: Convert to fraction form
   1,803.65/2,488.59 = 1,057.64/x
3. Step 3: Cross multiply
   1,803.65x = 2,488.59 × 1,057.64
4. Step 4: Simplify right side
   1,803.65x = 2,632,019.88
5. Step 5: Solve for x
   x = 2,632,019.88/1,803.65
6. Step 6: Final answer
   x = 1,459.28