Finding the Fourth Proportional to 13,109.16, 18,089.95 and 7,443.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.16 : 18,089.95 = 7,443.78 : x
2. Step 2: Convert to fraction form
   13,109.16/18,089.95 = 7,443.78/x
3. Step 3: Cross multiply
   13,109.16x = 18,089.95 × 7,443.78
4. Step 4: Simplify right side
   13,109.16x = 134,657,608.01
5. Step 5: Solve for x
   x = 134,657,608.01/13,109.16
6. Step 6: Final answer
   x = 10,272.02