Finding the Fourth Proportional to 12,388.55, 17,105.55 and 7,615.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,388.55 : 17,105.55 = 7,615.08 : x
2. Step 2: Convert to fraction form
   12,388.55/17,105.55 = 7,615.08/x
3. Step 3: Cross multiply
   12,388.55x = 17,105.55 × 7,615.08
4. Step 4: Simplify right side
   12,388.55x = 130,260,131.69
5. Step 5: Solve for x
   x = 130,260,131.69/12,388.55
6. Step 6: Final answer
   x = 10,514.56