Finding the Fourth Proportional to 12,685.02, 17,511.96 and 7,906.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,685.02 : 17,511.96 = 7,906.42 : x
2. Step 2: Convert to fraction form
   12,685.02/17,511.96 = 7,906.42/x
3. Step 3: Cross multiply
   12,685.02x = 17,511.96 × 7,906.42
4. Step 4: Simplify right side
   12,685.02x = 138,456,910.78
5. Step 5: Solve for x
   x = 138,456,910.78/12,685.02
6. Step 6: Final answer
   x = 10,914.99