Finding the Fourth Proportional to 12,902.29, 17,805.37 and 7,238.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,902.29 : 17,805.37 = 7,238.30 : x
2. Step 2: Convert to fraction form
   12,902.29/17,805.37 = 7,238.30/x
3. Step 3: Cross multiply
   12,902.29x = 17,805.37 × 7,238.30
4. Step 4: Simplify right side
   12,902.29x = 128,880,609.67
5. Step 5: Solve for x
   x = 128,880,609.67/12,902.29
6. Step 6: Final answer
   x = 9,988.97