Finding the Fourth Proportional to 1,667.24, 2,300.78 and 921.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.24 : 2,300.78 = 921.18 : x
2. Step 2: Convert to fraction form
   1,667.24/2,300.78 = 921.18/x
3. Step 3: Cross multiply
   1,667.24x = 2,300.78 × 921.18
4. Step 4: Simplify right side
   1,667.24x = 2,119,432.52
5. Step 5: Solve for x
   x = 2,119,432.52/1,667.24
6. Step 6: Final answer
   x = 1,271.22