Finding the Fourth Proportional to 12,945.83, 17,868.20 and 9,165.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.83 : 17,868.20 = 9,165.07 : x
2. Step 2: Convert to fraction form
   12,945.83/17,868.20 = 9,165.07/x
3. Step 3: Cross multiply
   12,945.83x = 17,868.20 × 9,165.07
4. Step 4: Simplify right side
   12,945.83x = 163,763,168.61
5. Step 5: Solve for x
   x = 163,763,168.61/12,945.83
6. Step 6: Final answer
   x = 12,649.88