Finding the Fourth Proportional to 1,667.38, 2,300.78 and 1,004.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.38 : 2,300.78 = 1,004.20 : x
2. Step 2: Convert to fraction form
   1,667.38/2,300.78 = 1,004.20/x
3. Step 3: Cross multiply
   1,667.38x = 2,300.78 × 1,004.20
4. Step 4: Simplify right side
   1,667.38x = 2,310,443.28
5. Step 5: Solve for x
   x = 2,310,443.28/1,667.38
6. Step 6: Final answer
   x = 1,385.67