Finding the Fourth Proportional to 1,667.45, 2,300.85 and 921.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.45 : 2,300.85 = 921.39 : x
2. Step 2: Convert to fraction form
   1,667.45/2,300.85 = 921.39/x
3. Step 3: Cross multiply
   1,667.45x = 2,300.85 × 921.39
4. Step 4: Simplify right side
   1,667.45x = 2,119,980.18
5. Step 5: Solve for x
   x = 2,119,980.18/1,667.45
6. Step 6: Final answer
   x = 1,271.39