Finding the Fourth Proportional to 2,113.32, 3,166.72 and 879.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.32 : 3,166.72 = 879.68 : x
2. Step 2: Convert to fraction form
   2,113.32/3,166.72 = 879.68/x
3. Step 3: Cross multiply
   2,113.32x = 3,166.72 × 879.68
4. Step 4: Simplify right side
   2,113.32x = 2,785,700.25
5. Step 5: Solve for x
   x = 2,785,700.25/2,113.32
6. Step 6: Final answer
   x = 1,318.16