Finding the Fourth Proportional to 2,167.46, 2,991.08 and 1,172.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.46 : 2,991.08 = 1,172.72 : x
2. Step 2: Convert to fraction form
   2,167.46/2,991.08 = 1,172.72/x
3. Step 3: Cross multiply
   2,167.46x = 2,991.08 × 1,172.72
4. Step 4: Simplify right side
   2,167.46x = 3,507,696.39
5. Step 5: Solve for x
   x = 3,507,696.39/2,167.46
6. Step 6: Final answer
   x = 1,618.34