Finding the Fourth Proportional to 20,742.04, 28,624.56 and 12,789.52

Step by Step Solution

1. Step 1: Write the proportion equation
   20,742.04 : 28,624.56 = 12,789.52 : x
2. Step 2: Convert to fraction form
   20,742.04/28,624.56 = 12,789.52/x
3. Step 3: Cross multiply
   20,742.04x = 28,624.56 × 12,789.52
4. Step 4: Simplify right side
   20,742.04x = 366,094,382.61
5. Step 5: Solve for x
   x = 366,094,382.61/20,742.04
6. Step 6: Final answer
   x = 17,649.87