Finding the Fourth Proportional to 2,112.30, 3,167.76 and 879.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.30 : 3,167.76 = 879.78 : x
2. Step 2: Convert to fraction form
   2,112.30/3,167.76 = 879.78/x
3. Step 3: Cross multiply
   2,112.30x = 3,167.76 × 879.78
4. Step 4: Simplify right side
   2,112.30x = 2,786,931.89
5. Step 5: Solve for x
   x = 2,786,931.89/2,112.30
6. Step 6: Final answer
   x = 1,319.38