Finding the Fourth Proportional to 12,804.01, 17,669.60 and 7,139.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,804.01 : 17,669.60 = 7,139.10 : x
2. Step 2: Convert to fraction form
   12,804.01/17,669.60 = 7,139.10/x
3. Step 3: Cross multiply
   12,804.01x = 17,669.60 × 7,139.10
4. Step 4: Simplify right side
   12,804.01x = 126,145,098.70
5. Step 5: Solve for x
   x = 126,145,098.70/12,804.01
6. Step 6: Final answer
   x = 9,852.00