Finding the Fourth Proportional to 28,789.50, 43,165.69 and 12,145.08

Step by Step Solution

1. Step 1: Write the proportion equation
   28,789.50 : 43,165.69 = 12,145.08 : x
2. Step 2: Convert to fraction form
   28,789.50/43,165.69 = 12,145.08/x
3. Step 3: Cross multiply
   28,789.50x = 43,165.69 × 12,145.08
4. Step 4: Simplify right side
   28,789.50x = 524,250,758.31
5. Step 5: Solve for x
   x = 524,250,758.31/28,789.50
6. Step 6: Final answer
   x = 18,209.79