Finding the Fourth Proportional to 12,402.05, 17,109.16 and 8,634.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,402.05 : 17,109.16 = 8,634.47 : x
2. Step 2: Convert to fraction form
   12,402.05/17,109.16 = 8,634.47/x
3. Step 3: Cross multiply
   12,402.05x = 17,109.16 × 8,634.47
4. Step 4: Simplify right side
   12,402.05x = 147,728,421.61
5. Step 5: Solve for x
   x = 147,728,421.61/12,402.05
6. Step 6: Final answer
   x = 11,911.62