Finding the Fourth Proportional to 13,131.13, 18,099.52 and 9,145.32

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131.13 : 18,099.52 = 9,145.32 : x
2. Step 2: Convert to fraction form
   13,131.13/18,099.52 = 9,145.32/x
3. Step 3: Cross multiply
   13,131.13x = 18,099.52 × 9,145.32
4. Step 4: Simplify right side
   13,131.13x = 165,525,913.32
5. Step 5: Solve for x
   x = 165,525,913.32/13,131.13
6. Step 6: Final answer
   x = 12,605.61