Finding the Fourth Proportional to 28,569.69, 42,882.18 and 13,789.01

Step by Step Solution

1. Step 1: Write the proportion equation
   28,569.69 : 42,882.18 = 13,789.01 : x
2. Step 2: Convert to fraction form
   28,569.69/42,882.18 = 13,789.01/x
3. Step 3: Cross multiply
   28,569.69x = 42,882.18 × 13,789.01
4. Step 4: Simplify right side
   28,569.69x = 591,302,864.34
5. Step 5: Solve for x
   x = 591,302,864.34/28,569.69
6. Step 6: Final answer
   x = 20,696.86