Finding the Fourth Proportional to 1,667.39, 2,301.01 and 921.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.39 : 2,301.01 = 921.31 : x
2. Step 2: Convert to fraction form
   1,667.39/2,301.01 = 921.31/x
3. Step 3: Cross multiply
   1,667.39x = 2,301.01 × 921.31
4. Step 4: Simplify right side
   1,667.39x = 2,119,935.47
5. Step 5: Solve for x
   x = 2,119,935.47/1,667.39
6. Step 6: Final answer
   x = 1,271.41