Finding the Fourth Proportional to 8,726.33, 13,005.50 and 8,712.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,726.33 : 13,005.50 = 8,712.50 : x
2. Step 2: Convert to fraction form
   8,726.33/13,005.50 = 8,712.50/x
3. Step 3: Cross multiply
   8,726.33x = 13,005.50 × 8,712.50
4. Step 4: Simplify right side
   8,726.33x = 113,310,310.16
5. Step 5: Solve for x
   x = 113,310,310.16/8,726.33
6. Step 6: Final answer
   x = 12,984.87