Finding the Fourth Proportional to 28,039.12, 42,064.81 and 8,317.15

Step by Step Solution

1. Step 1: Write the proportion equation
   28,039.12 : 42,064.81 = 8,317.15 : x
2. Step 2: Convert to fraction form
   28,039.12/42,064.81 = 8,317.15/x
3. Step 3: Cross multiply
   28,039.12x = 42,064.81 × 8,317.15
4. Step 4: Simplify right side
   28,039.12x = 349,859,208.54
5. Step 5: Solve for x
   x = 349,859,208.54/28,039.12
6. Step 6: Final answer
   x = 12,477.54