Finding the Fourth Proportional to 28,559.33, 42,856.71 and 13,769.75

Step by Step Solution

1. Step 1: Write the proportion equation
   28,559.33 : 42,856.71 = 13,769.75 : x
2. Step 2: Convert to fraction form
   28,559.33/42,856.71 = 13,769.75/x
3. Step 3: Cross multiply
   28,559.33x = 42,856.71 × 13,769.75
4. Step 4: Simplify right side
   28,559.33x = 590,126,182.52
5. Step 5: Solve for x
   x = 590,126,182.52/28,559.33
6. Step 6: Final answer
   x = 20,663.17