Finding the Fourth Proportional to 2,118.35, 3,178.59 and 885.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.35 : 3,178.59 = 885.74 : x
2. Step 2: Convert to fraction form
   2,118.35/3,178.59 = 885.74/x
3. Step 3: Cross multiply
   2,118.35x = 3,178.59 × 885.74
4. Step 4: Simplify right side
   2,118.35x = 2,815,390.07
5. Step 5: Solve for x
   x = 2,815,390.07/2,118.35
6. Step 6: Final answer
   x = 1,329.05