Finding the Fourth Proportional to 2,579.98, 3,870.65 and 1,118.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,579.98 : 3,870.65 = 1,118.79 : x
2. Step 2: Convert to fraction form
   2,579.98/3,870.65 = 1,118.79/x
3. Step 3: Cross multiply
   2,579.98x = 3,870.65 × 1,118.79
4. Step 4: Simplify right side
   2,579.98x = 4,330,444.51
5. Step 5: Solve for x
   x = 4,330,444.51/2,579.98
6. Step 6: Final answer
   x = 1,678.48