Finding the Fourth Proportional to 12,905.33, 17,808.27 and 7,239.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,905.33 : 17,808.27 = 7,239.29 : x
2. Step 2: Convert to fraction form
   12,905.33/17,808.27 = 7,239.29/x
3. Step 3: Cross multiply
   12,905.33x = 17,808.27 × 7,239.29
4. Step 4: Simplify right side
   12,905.33x = 128,919,141.89
5. Step 5: Solve for x
   x = 128,919,141.89/12,905.33
6. Step 6: Final answer
   x = 9,989.61