Finding the Fourth Proportional to 12,859.39, 17,756.02 and 9,870.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,859.39 : 17,756.02 = 9,870.49 : x
2. Step 2: Convert to fraction form
   12,859.39/17,756.02 = 9,870.49/x
3. Step 3: Cross multiply
   12,859.39x = 17,756.02 × 9,870.49
4. Step 4: Simplify right side
   12,859.39x = 175,260,529.07
5. Step 5: Solve for x
   x = 175,260,529.07/12,859.39
6. Step 6: Final answer
   x = 13,629.00