Finding the Fourth Proportional to 2,645.39, 3,965.28 and 888.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.39 : 3,965.28 = 888.72 : x
2. Step 2: Convert to fraction form
   2,645.39/3,965.28 = 888.72/x
3. Step 3: Cross multiply
   2,645.39x = 3,965.28 × 888.72
4. Step 4: Simplify right side
   2,645.39x = 3,524,023.64
5. Step 5: Solve for x
   x = 3,524,023.64/2,645.39
6. Step 6: Final answer
   x = 1,332.14