Finding the Fourth Proportional to 12,689.76, 17,501.15 and 9,510.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,689.76 : 17,501.15 = 9,510.51 : x
2. Step 2: Convert to fraction form
   12,689.76/17,501.15 = 9,510.51/x
3. Step 3: Cross multiply
   12,689.76x = 17,501.15 × 9,510.51
4. Step 4: Simplify right side
   12,689.76x = 166,444,814.53
5. Step 5: Solve for x
   x = 166,444,814.53/12,689.76
6. Step 6: Final answer
   x = 13,116.47