Finding the Fourth Proportional to 12,420.34, 17,147.37 and 7,707.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,420.34 : 17,147.37 = 7,707.22 : x
2. Step 2: Convert to fraction form
   12,420.34/17,147.37 = 7,707.22/x
3. Step 3: Cross multiply
   12,420.34x = 17,147.37 × 7,707.22
4. Step 4: Simplify right side
   12,420.34x = 132,158,553.01
5. Step 5: Solve for x
   x = 132,158,553.01/12,420.34
6. Step 6: Final answer
   x = 10,640.49