Finding the Fourth Proportional to 28,585.67, 42,855.61 and 13,585.26

Step by Step Solution

1. Step 1: Write the proportion equation
   28,585.67 : 42,855.61 = 13,585.26 : x
2. Step 2: Convert to fraction form
   28,585.67/42,855.61 = 13,585.26/x
3. Step 3: Cross multiply
   28,585.67x = 42,855.61 × 13,585.26
4. Step 4: Simplify right side
   28,585.67x = 582,204,595.82
5. Step 5: Solve for x
   x = 582,204,595.82/28,585.67
6. Step 6: Final answer
   x = 20,367.01