Finding the Fourth Proportional to 12,900.36, 17,802.64 and 7,236.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.36 : 17,802.64 = 7,236.30 : x
2. Step 2: Convert to fraction form
   12,900.36/17,802.64 = 7,236.30/x
3. Step 3: Cross multiply
   12,900.36x = 17,802.64 × 7,236.30
4. Step 4: Simplify right side
   12,900.36x = 128,825,243.83
5. Step 5: Solve for x
   x = 128,825,243.83/12,900.36
6. Step 6: Final answer
   x = 9,986.17