Finding the Fourth Proportional to 12,809.89, 17,677.74 and 7,145.01

Step by Step Solution

1. Step 1: Write the proportion equation
   12,809.89 : 17,677.74 = 7,145.01 : x
2. Step 2: Convert to fraction form
   12,809.89/17,677.74 = 7,145.01/x
3. Step 3: Cross multiply
   12,809.89x = 17,677.74 × 7,145.01
4. Step 4: Simplify right side
   12,809.89x = 126,307,629.08
5. Step 5: Solve for x
   x = 126,307,629.08/12,809.89
6. Step 6: Final answer
   x = 9,860.17