Finding the Fourth Proportional to 12,815.30, 17,685.06 and 7,150.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.30 : 17,685.06 = 7,150.52 : x
2. Step 2: Convert to fraction form
   12,815.30/17,685.06 = 7,150.52/x
3. Step 3: Cross multiply
   12,815.30x = 17,685.06 × 7,150.52
4. Step 4: Simplify right side
   12,815.30x = 126,457,375.23
5. Step 5: Solve for x
   x = 126,457,375.23/12,815.30
6. Step 6: Final answer
   x = 9,867.69