Finding the Fourth Proportional to 1,667.96, 2,301.55 and 921.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.96 : 2,301.55 = 921.71 : x
2. Step 2: Convert to fraction form
   1,667.96/2,301.55 = 921.71/x
3. Step 3: Cross multiply
   1,667.96x = 2,301.55 × 921.71
4. Step 4: Simplify right side
   1,667.96x = 2,121,365.10
5. Step 5: Solve for x
   x = 2,121,365.10/1,667.96
6. Step 6: Final answer
   x = 1,271.83