Finding the Fourth Proportional to 13,665.17, 18,857.43 and 7,697.39

Step by Step Solution

1. Step 1: Write the proportion equation
   13,665.17 : 18,857.43 = 7,697.39 : x
2. Step 2: Convert to fraction form
   13,665.17/18,857.43 = 7,697.39/x
3. Step 3: Cross multiply
   13,665.17x = 18,857.43 × 7,697.39
4. Step 4: Simplify right side
   13,665.17x = 145,152,898.82
5. Step 5: Solve for x
   x = 145,152,898.82/13,665.17
6. Step 6: Final answer
   x = 10,622.11