Finding the Fourth Proportional to 2,167.58, 2,991.25 and 1,172.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.58 : 2,991.25 = 1,172.87 : x
2. Step 2: Convert to fraction form
   2,167.58/2,991.25 = 1,172.87/x
3. Step 3: Cross multiply
   2,167.58x = 2,991.25 × 1,172.87
4. Step 4: Simplify right side
   2,167.58x = 3,508,344.46
5. Step 5: Solve for x
   x = 3,508,344.46/2,167.58
6. Step 6: Final answer
   x = 1,618.56