Finding the Fourth Proportional to 2,667.70, 4,000.20 and 912.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.70 : 4,000.20 = 912.43 : x
2. Step 2: Convert to fraction form
   2,667.70/4,000.20 = 912.43/x
3. Step 3: Cross multiply
   2,667.70x = 4,000.20 × 912.43
4. Step 4: Simplify right side
   2,667.70x = 3,649,902.49
5. Step 5: Solve for x
   x = 3,649,902.49/2,667.70
6. Step 6: Final answer
   x = 1,368.18