Finding the Fourth Proportional to 1,667.55, 2,301.18 and 921.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.55 : 2,301.18 = 921.51 : x
2. Step 2: Convert to fraction form
   1,667.55/2,301.18 = 921.51/x
3. Step 3: Cross multiply
   1,667.55x = 2,301.18 × 921.51
4. Step 4: Simplify right side
   1,667.55x = 2,120,560.38
5. Step 5: Solve for x
   x = 2,120,560.38/1,667.55
6. Step 6: Final answer
   x = 1,271.66