Finding the Fourth Proportional to 12,679.40, 17,496.81 and 7,645.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,679.40 : 17,496.81 = 7,645.25 : x
2. Step 2: Convert to fraction form
   12,679.40/17,496.81 = 7,645.25/x
3. Step 3: Cross multiply
   12,679.40x = 17,496.81 × 7,645.25
4. Step 4: Simplify right side
   12,679.40x = 133,767,530.39
5. Step 5: Solve for x
   x = 133,767,530.39/12,679.40
6. Step 6: Final answer
   x = 10,549.99