Finding the Fourth Proportional to 1,658.88, 2,485.89 and 879.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,658.88 : 2,485.89 = 879.39 : x
2. Step 2: Convert to fraction form
   1,658.88/2,485.89 = 879.39/x
3. Step 3: Cross multiply
   1,658.88x = 2,485.89 × 879.39
4. Step 4: Simplify right side
   1,658.88x = 2,186,066.81
5. Step 5: Solve for x
   x = 2,186,066.81/1,658.88
6. Step 6: Final answer
   x = 1,317.80