Finding the Fourth Proportional to 13,128.67, 18,118.64 and 7,465.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,128.67 : 18,118.64 = 7,465.20 : x
2. Step 2: Convert to fraction form
   13,128.67/18,118.64 = 7,465.20/x
3. Step 3: Cross multiply
   13,128.67x = 18,118.64 × 7,465.20
4. Step 4: Simplify right side
   13,128.67x = 135,259,271.33
5. Step 5: Solve for x
   x = 135,259,271.33/13,128.67
6. Step 6: Final answer
   x = 10,302.59