Finding the Fourth Proportional to 2,168.61, 2,992.66 and 1,173.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.61 : 2,992.66 = 1,173.88 : x
2. Step 2: Convert to fraction form
   2,168.61/2,992.66 = 1,173.88/x
3. Step 3: Cross multiply
   2,168.61x = 2,992.66 × 1,173.88
4. Step 4: Simplify right side
   2,168.61x = 3,513,023.72
5. Step 5: Solve for x
   x = 3,513,023.72/2,168.61
6. Step 6: Final answer
   x = 1,619.94