Finding the Fourth Proportional to 1,667.40, 2,504.52 and 1,279.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.40 : 2,504.52 = 1,279.20 : x
2. Step 2: Convert to fraction form
   1,667.40/2,504.52 = 1,279.20/x
3. Step 3: Cross multiply
   1,667.40x = 2,504.52 × 1,279.20
4. Step 4: Simplify right side
   1,667.40x = 3,203,781.98
5. Step 5: Solve for x
   x = 3,203,781.98/1,667.40
6. Step 6: Final answer
   x = 1,921.42