Finding the Fourth Proportional to 11,665.21, 16,108.05 and 10,003.09

Step by Step Solution

1. Step 1: Write the proportion equation
   11,665.21 : 16,108.05 = 10,003.09 : x
2. Step 2: Convert to fraction form
   11,665.21/16,108.05 = 10,003.09/x
3. Step 3: Cross multiply
   11,665.21x = 16,108.05 × 10,003.09
4. Step 4: Simplify right side
   11,665.21x = 161,130,273.87
5. Step 5: Solve for x
   x = 161,130,273.87/11,665.21
6. Step 6: Final answer
   x = 13,812.89