Finding the Fourth Proportional to 1,667.67, 2,301.35 and 921.66

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.67 : 2,301.35 = 921.66 : x
2. Step 2: Convert to fraction form
   1,667.67/2,301.35 = 921.66/x
3. Step 3: Cross multiply
   1,667.67x = 2,301.35 × 921.66
4. Step 4: Simplify right side
   1,667.67x = 2,121,064.55
5. Step 5: Solve for x
   x = 2,121,064.55/1,667.67
6. Step 6: Final answer
   x = 1,271.87