Finding the Fourth Proportional to 1,667.69, 2,301.09 and 921.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.69 : 2,301.09 = 921.63 : x
2. Step 2: Convert to fraction form
   1,667.69/2,301.09 = 921.63/x
3. Step 3: Cross multiply
   1,667.69x = 2,301.09 × 921.63
4. Step 4: Simplify right side
   1,667.69x = 2,120,753.58
5. Step 5: Solve for x
   x = 2,120,753.58/1,667.69
6. Step 6: Final answer
   x = 1,271.68