Finding the Fourth Proportional to 12,890.24, 17,788.28 and 7,513.68

Step by Step Solution

1. Step 1: Write the proportion equation
   12,890.24 : 17,788.28 = 7,513.68 : x
2. Step 2: Convert to fraction form
   12,890.24/17,788.28 = 7,513.68/x
3. Step 3: Cross multiply
   12,890.24x = 17,788.28 × 7,513.68
4. Step 4: Simplify right side
   12,890.24x = 133,655,443.67
5. Step 5: Solve for x
   x = 133,655,443.67/12,890.24
6. Step 6: Final answer
   x = 10,368.73