Finding the Fourth Proportional to 8,425.89, 12,619.70 and 5,131.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,425.89 : 12,619.70 = 5,131.72 : x
2. Step 2: Convert to fraction form
   8,425.89/12,619.70 = 5,131.72/x
3. Step 3: Cross multiply
   8,425.89x = 12,619.70 × 5,131.72
4. Step 4: Simplify right side
   8,425.89x = 64,760,776.24
5. Step 5: Solve for x
   x = 64,760,776.24/8,425.89
6. Step 6: Final answer
   x = 7,685.93