Finding the Fourth Proportional to 42,379.07, 58,491.18 and 28,039.19

Step by Step Solution

1. Step 1: Write the proportion equation
   42,379.07 : 58,491.18 = 28,039.19 : x
2. Step 2: Convert to fraction form
   42,379.07/58,491.18 = 28,039.19/x
3. Step 3: Cross multiply
   42,379.07x = 58,491.18 × 28,039.19
4. Step 4: Simplify right side
   42,379.07x = 1,640,045,016.89
5. Step 5: Solve for x
   x = 1,640,045,016.89/42,379.07
6. Step 6: Final answer
   x = 38,699.41