Finding the Fourth Proportional to 2,111.50, 3,165.90 and 879.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.50 : 3,165.90 = 879.76 : x
2. Step 2: Convert to fraction form
   2,111.50/3,165.90 = 879.76/x
3. Step 3: Cross multiply
   2,111.50x = 3,165.90 × 879.76
4. Step 4: Simplify right side
   2,111.50x = 2,785,232.18
5. Step 5: Solve for x
   x = 2,785,232.18/2,111.50
6. Step 6: Final answer
   x = 1,319.08