Finding the Fourth Proportional to 28,039.82, 42,043.96 and 9,309.83

Step by Step Solution

1. Step 1: Write the proportion equation
   28,039.82 : 42,043.96 = 9,309.83 : x
2. Step 2: Convert to fraction form
   28,039.82/42,043.96 = 9,309.83/x
3. Step 3: Cross multiply
   28,039.82x = 42,043.96 × 9,309.83
4. Step 4: Simplify right side
   28,039.82x = 391,422,091.42
5. Step 5: Solve for x
   x = 391,422,091.42/28,039.82
6. Step 6: Final answer
   x = 13,959.51