Finding the Fourth Proportional to 1,805.83, 2,491.45 and 1,216.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.83 : 2,491.45 = 1,216.69 : x
2. Step 2: Convert to fraction form
   1,805.83/2,491.45 = 1,216.69/x
3. Step 3: Cross multiply
   1,805.83x = 2,491.45 × 1,216.69
4. Step 4: Simplify right side
   1,805.83x = 3,031,322.30
5. Step 5: Solve for x
   x = 3,031,322.30/1,805.83
6. Step 6: Final answer
   x = 1,678.63