Finding the Fourth Proportional to 12,685.05, 17,511.48 and 8,443.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,685.05 : 17,511.48 = 8,443.17 : x
2. Step 2: Convert to fraction form
   12,685.05/17,511.48 = 8,443.17/x
3. Step 3: Cross multiply
   12,685.05x = 17,511.48 × 8,443.17
4. Step 4: Simplify right side
   12,685.05x = 147,852,402.59
5. Step 5: Solve for x
   x = 147,852,402.59/12,685.05
6. Step 6: Final answer
   x = 11,655.64