Finding the Fourth Proportional to 13,145.02, 18,138.53 and 7,480.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,145.02 : 18,138.53 = 7,480.49 : x
2. Step 2: Convert to fraction form
   13,145.02/18,138.53 = 7,480.49/x
3. Step 3: Cross multiply
   13,145.02x = 18,138.53 × 7,480.49
4. Step 4: Simplify right side
   13,145.02x = 135,685,054.88
5. Step 5: Solve for x
   x = 135,685,054.88/13,145.02
6. Step 6: Final answer
   x = 10,322.17