Finding the Fourth Proportional to 12,828.57, 17,699.27 and 7,162.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,828.57 : 17,699.27 = 7,162.40 : x
2. Step 2: Convert to fraction form
   12,828.57/17,699.27 = 7,162.40/x
3. Step 3: Cross multiply
   12,828.57x = 17,699.27 × 7,162.40
4. Step 4: Simplify right side
   12,828.57x = 126,769,127.14
5. Step 5: Solve for x
   x = 126,769,127.14/12,828.57
6. Step 6: Final answer
   x = 9,881.78