Finding the Fourth Proportional to 8,488.72, 12,733.76 and 2,645.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,488.72 : 12,733.76 = 2,645.38 : x
2. Step 2: Convert to fraction form
   8,488.72/12,733.76 = 2,645.38/x
3. Step 3: Cross multiply
   8,488.72x = 12,733.76 × 2,645.38
4. Step 4: Simplify right side
   8,488.72x = 33,685,634.03
5. Step 5: Solve for x
   x = 33,685,634.03/8,488.72
6. Step 6: Final answer
   x = 3,968.28