Finding the Fourth Proportional to 12,109.80, 18,164.58 and 7,175.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.80 : 18,164.58 = 7,175.89 : x
2. Step 2: Convert to fraction form
   12,109.80/18,164.58 = 7,175.89/x
3. Step 3: Cross multiply
   12,109.80x = 18,164.58 × 7,175.89
4. Step 4: Simplify right side
   12,109.80x = 130,346,937.15
5. Step 5: Solve for x
   x = 130,346,937.15/12,109.80
6. Step 6: Final answer
   x = 10,763.76