Finding the Fourth Proportional to 2,389.05, 3,585.55 and 1,219.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.05 : 3,585.55 = 1,219.92 : x
2. Step 2: Convert to fraction form
   2,389.05/3,585.55 = 1,219.92/x
3. Step 3: Cross multiply
   2,389.05x = 3,585.55 × 1,219.92
4. Step 4: Simplify right side
   2,389.05x = 4,374,084.16
5. Step 5: Solve for x
   x = 4,374,084.16/2,389.05
6. Step 6: Final answer
   x = 1,830.89