Finding the Fourth Proportional to 12,809.94, 17,677.82 and 7,145.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,809.94 : 17,677.82 = 7,145.05 : x
2. Step 2: Convert to fraction form
   12,809.94/17,677.82 = 7,145.05/x
3. Step 3: Cross multiply
   12,809.94x = 17,677.82 × 7,145.05
4. Step 4: Simplify right side
   12,809.94x = 126,308,947.75
5. Step 5: Solve for x
   x = 126,308,947.75/12,809.94
6. Step 6: Final answer
   x = 9,860.23