Finding the Fourth Proportional to 12,845.40, 17,727.90 and 7,808.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,845.40 : 17,727.90 = 7,808.52 : x
2. Step 2: Convert to fraction form
   12,845.40/17,727.90 = 7,808.52/x
3. Step 3: Cross multiply
   12,845.40x = 17,727.90 × 7,808.52
4. Step 4: Simplify right side
   12,845.40x = 138,428,661.71
5. Step 5: Solve for x
   x = 138,428,661.71/12,845.40
6. Step 6: Final answer
   x = 10,776.52