Finding the Fourth Proportional to 1,667.28, 2,300.67 and 921.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.28 : 2,300.67 = 921.03 : x
2. Step 2: Convert to fraction form
   1,667.28/2,300.67 = 921.03/x
3. Step 3: Cross multiply
   1,667.28x = 2,300.67 × 921.03
4. Step 4: Simplify right side
   1,667.28x = 2,118,986.09
5. Step 5: Solve for x
   x = 2,118,986.09/1,667.28
6. Step 6: Final answer
   x = 1,270.92