Finding the Fourth Proportional to 2,118.62, 2,923.72 and 1,187.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.62 : 2,923.72 = 1,187.18 : x
2. Step 2: Convert to fraction form
   2,118.62/2,923.72 = 1,187.18/x
3. Step 3: Cross multiply
   2,118.62x = 2,923.72 × 1,187.18
4. Step 4: Simplify right side
   2,118.62x = 3,470,981.91
5. Step 5: Solve for x
   x = 3,470,981.91/2,118.62
6. Step 6: Final answer
   x = 1,638.32