Finding the Fourth Proportional to 12,689.52, 17,499.90 and 10,896.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,689.52 : 17,499.90 = 10,896.39 : x
2. Step 2: Convert to fraction form
   12,689.52/17,499.90 = 10,896.39/x
3. Step 3: Cross multiply
   12,689.52x = 17,499.90 × 10,896.39
4. Step 4: Simplify right side
   12,689.52x = 190,685,647.86
5. Step 5: Solve for x
   x = 190,685,647.86/12,689.52
6. Step 6: Final answer
   x = 15,027.02