Finding the Fourth Proportional to 13,080.69, 18,051.10 and 7,112.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,080.69 : 18,051.10 = 7,112.31 : x
2. Step 2: Convert to fraction form
   13,080.69/18,051.10 = 7,112.31/x
3. Step 3: Cross multiply
   13,080.69x = 18,051.10 × 7,112.31
4. Step 4: Simplify right side
   13,080.69x = 128,384,973.58
5. Step 5: Solve for x
   x = 128,384,973.58/13,080.69
6. Step 6: Final answer
   x = 9,814.85