Finding the Fourth Proportional to 1,443.04, 1,981.80 and 1,209.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.04 : 1,981.80 = 1,209.76 : x
2. Step 2: Convert to fraction form
   1,443.04/1,981.80 = 1,209.76/x
3. Step 3: Cross multiply
   1,443.04x = 1,981.80 × 1,209.76
4. Step 4: Simplify right side
   1,443.04x = 2,397,502.37
5. Step 5: Solve for x
   x = 2,397,502.37/1,443.04
6. Step 6: Final answer
   x = 1,661.42