Finding the Fourth Proportional to 13,109.21, 18,091.16 and 7,443.77

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.21 : 18,091.16 = 7,443.77 : x
2. Step 2: Convert to fraction form
   13,109.21/18,091.16 = 7,443.77/x
3. Step 3: Cross multiply
   13,109.21x = 18,091.16 × 7,443.77
4. Step 4: Simplify right side
   13,109.21x = 134,666,402.15
5. Step 5: Solve for x
   x = 134,666,402.15/13,109.21
6. Step 6: Final answer
   x = 10,272.65