Finding the Fourth Proportional to 28,538.61, 42,789.69 and 13,718.04

Step by Step Solution

1. Step 1: Write the proportion equation
   28,538.61 : 42,789.69 = 13,718.04 : x
2. Step 2: Convert to fraction form
   28,538.61/42,789.69 = 13,718.04/x
3. Step 3: Cross multiply
   28,538.61x = 42,789.69 × 13,718.04
4. Step 4: Simplify right side
   28,538.61x = 586,990,679.01
5. Step 5: Solve for x
   x = 586,990,679.01/28,538.61
6. Step 6: Final answer
   x = 20,568.30