Finding the Fourth Proportional to 1,667.57, 2,301.20 and 921.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.57 : 2,301.20 = 921.47 : x
2. Step 2: Convert to fraction form
   1,667.57/2,301.20 = 921.47/x
3. Step 3: Cross multiply
   1,667.57x = 2,301.20 × 921.47
4. Step 4: Simplify right side
   1,667.57x = 2,120,487.91
5. Step 5: Solve for x
   x = 2,120,487.91/1,667.57
6. Step 6: Final answer
   x = 1,271.61