Finding the Fourth Proportional to 2,167.90, 2,991.71 and 1,173.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.90 : 2,991.71 = 1,173.18 : x
2. Step 2: Convert to fraction form
   2,167.90/2,991.71 = 1,173.18/x
3. Step 3: Cross multiply
   2,167.90x = 2,991.71 × 1,173.18
4. Step 4: Simplify right side
   2,167.90x = 3,509,799.82
5. Step 5: Solve for x
   x = 3,509,799.82/2,167.90
6. Step 6: Final answer
   x = 1,618.99