Finding the Fourth Proportional to 1,667.85, 2,301.62 and 921.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.85 : 2,301.62 = 921.80 : x
2. Step 2: Convert to fraction form
   1,667.85/2,301.62 = 921.80/x
3. Step 3: Cross multiply
   1,667.85x = 2,301.62 × 921.80
4. Step 4: Simplify right side
   1,667.85x = 2,121,634.46
5. Step 5: Solve for x
   x = 2,121,634.46/1,667.85
6. Step 6: Final answer
   x = 1,272.08