Finding the Fourth Proportional to 12,900.29, 17,802.61 and 7,236.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.29 : 17,802.61 = 7,236.30 : x
2. Step 2: Convert to fraction form
   12,900.29/17,802.61 = 7,236.30/x
3. Step 3: Cross multiply
   12,900.29x = 17,802.61 × 7,236.30
4. Step 4: Simplify right side
   12,900.29x = 128,825,008.65
5. Step 5: Solve for x
   x = 128,825,008.65/12,900.29
6. Step 6: Final answer
   x = 9,986.21