Finding the Fourth Proportional to 1,667.97, 2,301.65 and 921.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.97 : 2,301.65 = 921.91 : x
2. Step 2: Convert to fraction form
   1,667.97/2,301.65 = 921.91/x
3. Step 3: Cross multiply
   1,667.97x = 2,301.65 × 921.91
4. Step 4: Simplify right side
   1,667.97x = 2,121,921.35
5. Step 5: Solve for x
   x = 2,121,921.35/1,667.97
6. Step 6: Final answer
   x = 1,272.16