Finding the Fourth Proportional to 2,667.81, 4,002.05 and 913.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.81 : 4,002.05 = 913.15 : x
2. Step 2: Convert to fraction form
   2,667.81/4,002.05 = 913.15/x
3. Step 3: Cross multiply
   2,667.81x = 4,002.05 × 913.15
4. Step 4: Simplify right side
   2,667.81x = 3,654,471.96
5. Step 5: Solve for x
   x = 3,654,471.96/2,667.81
6. Step 6: Final answer
   x = 1,369.84