Finding the Fourth Proportional to 1,918.91, 2,647.73 and 1,173.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,918.91 : 2,647.73 = 1,173.05 : x
2. Step 2: Convert to fraction form
   1,918.91/2,647.73 = 1,173.05/x
3. Step 3: Cross multiply
   1,918.91x = 2,647.73 × 1,173.05
4. Step 4: Simplify right side
   1,918.91x = 3,105,900.57
5. Step 5: Solve for x
   x = 3,105,900.57/1,918.91
6. Step 6: Final answer
   x = 1,618.58