Finding the Fourth Proportional to 1,661.05, 2,485.18 and 1,219.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.05 : 2,485.18 = 1,219.40 : x
2. Step 2: Convert to fraction form
   1,661.05/2,485.18 = 1,219.40/x
3. Step 3: Cross multiply
   1,661.05x = 2,485.18 × 1,219.40
4. Step 4: Simplify right side
   1,661.05x = 3,030,428.49
5. Step 5: Solve for x
   x = 3,030,428.49/1,661.05
6. Step 6: Final answer
   x = 1,824.41