Finding the Fourth Proportional to 2,635.29, 3,953.32 and 879.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,635.29 : 3,953.32 = 879.72 : x
2. Step 2: Convert to fraction form
   2,635.29/3,953.32 = 879.72/x
3. Step 3: Cross multiply
   2,635.29x = 3,953.32 × 879.72
4. Step 4: Simplify right side
   2,635.29x = 3,477,814.67
5. Step 5: Solve for x
   x = 3,477,814.67/2,635.29
6. Step 6: Final answer
   x = 1,319.71