Finding the Fourth Proportional to 13,333.20, 18,477.58 and 13,145.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,333.20 : 18,477.58 = 13,145.28 : x
2. Step 2: Convert to fraction form
   13,333.20/18,477.58 = 13,145.28/x
3. Step 3: Cross multiply
   13,333.20x = 18,477.58 × 13,145.28
4. Step 4: Simplify right side
   13,333.20x = 242,892,962.82
5. Step 5: Solve for x
   x = 242,892,962.82/13,333.20
6. Step 6: Final answer
   x = 18,217.15