Finding the Fourth Proportional to 12,456, 17,189.28 and 7,488

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456 : 17,189.28 = 7,488 : x
2. Step 2: Convert to fraction form
   12,456/17,189.28 = 7,488/x
3. Step 3: Cross multiply
   12,456x = 17,189.28 × 7,488
4. Step 4: Simplify right side
   12,456x = 128,713,328.64
5. Step 5: Solve for x
   x = 128,713,328.64/12,456
6. Step 6: Final answer
   x = 10,333.44