Finding the Fourth Proportional to 12,807.09, 17,668.71 and 7,769.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,807.09 : 17,668.71 = 7,769.48 : x
2. Step 2: Convert to fraction form
   12,807.09/17,668.71 = 7,769.48/x
3. Step 3: Cross multiply
   12,807.09x = 17,668.71 × 7,769.48
4. Step 4: Simplify right side
   12,807.09x = 137,276,600.63
5. Step 5: Solve for x
   x = 137,276,600.63/12,807.09
6. Step 6: Final answer
   x = 10,718.80