Finding the Fourth Proportional to 1,659.05, 2,487.71 and 879.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.05 : 2,487.71 = 879.49 : x
2. Step 2: Convert to fraction form
   1,659.05/2,487.71 = 879.49/x
3. Step 3: Cross multiply
   1,659.05x = 2,487.71 × 879.49
4. Step 4: Simplify right side
   1,659.05x = 2,187,921.38
5. Step 5: Solve for x
   x = 2,187,921.38/1,659.05
6. Step 6: Final answer
   x = 1,318.78