Finding the Fourth Proportional to 2,167.89, 2,991.66 and 1,173.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.89 : 2,991.66 = 1,173.15 : x
2. Step 2: Convert to fraction form
   2,167.89/2,991.66 = 1,173.15/x
3. Step 3: Cross multiply
   2,167.89x = 2,991.66 × 1,173.15
4. Step 4: Simplify right side
   2,167.89x = 3,509,670.33
5. Step 5: Solve for x
   x = 3,509,670.33/2,167.89
6. Step 6: Final answer
   x = 1,618.93