Finding the Fourth Proportional to 2,947.79, 4,421.12 and 867.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,947.79 : 4,421.12 = 867.89 : x
2. Step 2: Convert to fraction form
   2,947.79/4,421.12 = 867.89/x
3. Step 3: Cross multiply
   2,947.79x = 4,421.12 × 867.89
4. Step 4: Simplify right side
   2,947.79x = 3,837,019.39
5. Step 5: Solve for x
   x = 3,837,019.39/2,947.79
6. Step 6: Final answer
   x = 1,301.66