Finding the Fourth Proportional to 1,667.58, 2,301.22 and 921.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.58 : 2,301.22 = 921.61 : x
2. Step 2: Convert to fraction form
   1,667.58/2,301.22 = 921.61/x
3. Step 3: Cross multiply
   1,667.58x = 2,301.22 × 921.61
4. Step 4: Simplify right side
   1,667.58x = 2,120,827.36
5. Step 5: Solve for x
   x = 2,120,827.36/1,667.58
6. Step 6: Final answer
   x = 1,271.80