Finding the Fourth Proportional to 13,131.06, 18,120.98 and 7,162.75

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131.06 : 18,120.98 = 7,162.75 : x
2. Step 2: Convert to fraction form
   13,131.06/18,120.98 = 7,162.75/x
3. Step 3: Cross multiply
   13,131.06x = 18,120.98 × 7,162.75
4. Step 4: Simplify right side
   13,131.06x = 129,796,058.98
5. Step 5: Solve for x
   x = 129,796,058.98/13,131.06
6. Step 6: Final answer
   x = 9,884.66