Finding the Fourth Proportional to 12,456.99, 17,189.87 and 7,148.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456.99 : 17,189.87 = 7,148.07 : x
2. Step 2: Convert to fraction form
   12,456.99/17,189.87 = 7,148.07/x
3. Step 3: Cross multiply
   12,456.99x = 17,189.87 × 7,148.07
4. Step 4: Simplify right side
   12,456.99x = 122,874,358.31
5. Step 5: Solve for x
   x = 122,874,358.31/12,456.99
6. Step 6: Final answer
   x = 9,863.89