Finding the Fourth Proportional to 13,109.19, 18,090.86 and 7,443.51

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.19 : 18,090.86 = 7,443.51 : x
2. Step 2: Convert to fraction form
   13,109.19/18,090.86 = 7,443.51/x
3. Step 3: Cross multiply
   13,109.19x = 18,090.86 × 7,443.51
4. Step 4: Simplify right side
   13,109.19x = 134,659,460.10
5. Step 5: Solve for x
   x = 134,659,460.10/13,109.19
6. Step 6: Final answer
   x = 10,272.14