Finding the Fourth Proportional to 13,200.84, 18,216.90 and 8,165.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,200.84 : 18,216.90 = 8,165.88 : x
2. Step 2: Convert to fraction form
   13,200.84/18,216.90 = 8,165.88/x
3. Step 3: Cross multiply
   13,200.84x = 18,216.90 × 8,165.88
4. Step 4: Simplify right side
   13,200.84x = 148,757,019.37
5. Step 5: Solve for x
   x = 148,757,019.37/13,200.84
6. Step 6: Final answer
   x = 11,268.75