Finding the Fourth Proportional to 12,818.69, 17,685.64 and 7,152.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,818.69 : 17,685.64 = 7,152.51 : x
2. Step 2: Convert to fraction form
   12,818.69/17,685.64 = 7,152.51/x
3. Step 3: Cross multiply
   12,818.69x = 17,685.64 × 7,152.51
4. Step 4: Simplify right side
   12,818.69x = 126,496,716.96
5. Step 5: Solve for x
   x = 126,496,716.96/12,818.69
6. Step 6: Final answer
   x = 9,868.15