Finding the Fourth Proportional to 12,609, 17,400.54 and 7,020.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,609 : 17,400.54 = 7,020.12 : x
2. Step 2: Convert to fraction form
   12,609/17,400.54 = 7,020.12/x
3. Step 3: Cross multiply
   12,609x = 17,400.54 × 7,020.12
4. Step 4: Simplify right side
   12,609x = 122,153,878.86
5. Step 5: Solve for x
   x = 122,153,878.86/12,609
6. Step 6: Final answer
   x = 9,687.83