Finding the Fourth Proportional to 1,667.60, 2,301.35 and 921.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.60 : 2,301.35 = 921.59 : x
2. Step 2: Convert to fraction form
   1,667.60/2,301.35 = 921.59/x
3. Step 3: Cross multiply
   1,667.60x = 2,301.35 × 921.59
4. Step 4: Simplify right side
   1,667.60x = 2,120,901.15
5. Step 5: Solve for x
   x = 2,120,901.15/1,667.60
6. Step 6: Final answer
   x = 1,271.83