Finding the Fourth Proportional to 1,667.91, 2,301.72 and 921.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.91 : 2,301.72 = 921.92 : x
2. Step 2: Convert to fraction form
   1,667.91/2,301.72 = 921.92/x
3. Step 3: Cross multiply
   1,667.91x = 2,301.72 × 921.92
4. Step 4: Simplify right side
   1,667.91x = 2,121,990.19
5. Step 5: Solve for x
   x = 2,121,990.19/1,667.91
6. Step 6: Final answer
   x = 1,272.25