Finding the Fourth Proportional to 1,667.66, 2,301.32 and 921.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.66 : 2,301.32 = 921.68 : x
2. Step 2: Convert to fraction form
   1,667.66/2,301.32 = 921.68/x
3. Step 3: Cross multiply
   1,667.66x = 2,301.32 × 921.68
4. Step 4: Simplify right side
   1,667.66x = 2,121,080.62
5. Step 5: Solve for x
   x = 2,121,080.62/1,667.66
6. Step 6: Final answer
   x = 1,271.89