Finding the Fourth Proportional to 2,166.51, 2,989.78 and 1,171.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,166.51 : 2,989.78 = 1,171.79 : x
2. Step 2: Convert to fraction form
   2,166.51/2,989.78 = 1,171.79/x
3. Step 3: Cross multiply
   2,166.51x = 2,989.78 × 1,171.79
4. Step 4: Simplify right side
   2,166.51x = 3,503,373.50
5. Step 5: Solve for x
   x = 3,503,373.50/2,166.51
6. Step 6: Final answer
   x = 1,617.06