Finding the Fourth Proportional to 28,111.36, 42,162.56 and 9,389.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.36 : 42,162.56 = 9,389.76 : x
2. Step 2: Convert to fraction form
   28,111.36/42,162.56 = 9,389.76/x
3. Step 3: Cross multiply
   28,111.36x = 42,162.56 × 9,389.76
4. Step 4: Simplify right side
   28,111.36x = 395,896,319.39
5. Step 5: Solve for x
   x = 395,896,319.39/28,111.36
6. Step 6: Final answer
   x = 14,083.14