Finding the Fourth Proportional to 42,121.81, 58,039.50 and 28,669.33

Step by Step Solution

1. Step 1: Write the proportion equation
   42,121.81 : 58,039.50 = 28,669.33 : x
2. Step 2: Convert to fraction form
   42,121.81/58,039.50 = 28,669.33/x
3. Step 3: Cross multiply
   42,121.81x = 58,039.50 × 28,669.33
4. Step 4: Simplify right side
   42,121.81x = 1,663,953,578.54
5. Step 5: Solve for x
   x = 1,663,953,578.54/42,121.81
6. Step 6: Final answer
   x = 39,503.37