Finding the Fourth Proportional to 8,499.26, 12,735.90 and 5,715.63

Step by Step Solution

1. Step 1: Write the proportion equation
   8,499.26 : 12,735.90 = 5,715.63 : x
2. Step 2: Convert to fraction form
   8,499.26/12,735.90 = 5,715.63/x
3. Step 3: Cross multiply
   8,499.26x = 12,735.90 × 5,715.63
4. Step 4: Simplify right side
   8,499.26x = 72,793,692.12
5. Step 5: Solve for x
   x = 72,793,692.12/8,499.26
6. Step 6: Final answer
   x = 8,564.71