Finding the Fourth Proportional to 10,693.05, 16,009.20 and 10,111.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,693.05 : 16,009.20 = 10,111.20 : x
2. Step 2: Convert to fraction form
   10,693.05/16,009.20 = 10,111.20/x
3. Step 3: Cross multiply
   10,693.05x = 16,009.20 × 10,111.20
4. Step 4: Simplify right side
   10,693.05x = 161,872,223.04
5. Step 5: Solve for x
   x = 161,872,223.04/10,693.05
6. Step 6: Final answer
   x = 15,138.08