Finding the Fourth Proportional to 12,492.42, 17,239.78 and 7,115.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,492.42 : 17,239.78 = 7,115.48 : x
2. Step 2: Convert to fraction form
   12,492.42/17,239.78 = 7,115.48/x
3. Step 3: Cross multiply
   12,492.42x = 17,239.78 × 7,115.48
4. Step 4: Simplify right side
   12,492.42x = 122,669,309.79
5. Step 5: Solve for x
   x = 122,669,309.79/12,492.42
6. Step 6: Final answer
   x = 9,819.50