Finding the Fourth Proportional to 12,456.45, 17,188.47 and 7,419.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456.45 : 17,188.47 = 7,419.96 : x
2. Step 2: Convert to fraction form
   12,456.45/17,188.47 = 7,419.96/x
3. Step 3: Cross multiply
   12,456.45x = 17,188.47 × 7,419.96
4. Step 4: Simplify right side
   12,456.45x = 127,537,759.86
5. Step 5: Solve for x
   x = 127,537,759.86/12,456.45
6. Step 6: Final answer
   x = 10,238.69