Finding the Fourth Proportional to 1,667.36, 2,300.64 and 1,143.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.36 : 2,300.64 = 1,143.20 : x
2. Step 2: Convert to fraction form
   1,667.36/2,300.64 = 1,143.20/x
3. Step 3: Cross multiply
   1,667.36x = 2,300.64 × 1,143.20
4. Step 4: Simplify right side
   1,667.36x = 2,630,091.65
5. Step 5: Solve for x
   x = 2,630,091.65/1,667.36
6. Step 6: Final answer
   x = 1,577.40