Finding the Fourth Proportional to 1,667.64, 2,301.36 and 921.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.64 : 2,301.36 = 921.62 : x
2. Step 2: Convert to fraction form
   1,667.64/2,301.36 = 921.62/x
3. Step 3: Cross multiply
   1,667.64x = 2,301.36 × 921.62
4. Step 4: Simplify right side
   1,667.64x = 2,120,979.40
5. Step 5: Solve for x
   x = 2,120,979.40/1,667.64
6. Step 6: Final answer
   x = 1,271.84