Finding the Fourth Proportional to 12,722.77, 17,556.54 and 7,345.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,722.77 : 17,556.54 = 7,345.42 : x
2. Step 2: Convert to fraction form
   12,722.77/17,556.54 = 7,345.42/x
3. Step 3: Cross multiply
   12,722.77x = 17,556.54 × 7,345.42
4. Step 4: Simplify right side
   12,722.77x = 128,960,160.05
5. Step 5: Solve for x
   x = 128,960,160.05/12,722.77
6. Step 6: Final answer
   x = 10,136.17