Finding the Fourth Proportional to 28,381.07, 42,581.33 and 10,855.91

Step by Step Solution

1. Step 1: Write the proportion equation
   28,381.07 : 42,581.33 = 10,855.91 : x
2. Step 2: Convert to fraction form
   28,381.07/42,581.33 = 10,855.91/x
3. Step 3: Cross multiply
   28,381.07x = 42,581.33 × 10,855.91
4. Step 4: Simplify right side
   28,381.07x = 462,259,086.16
5. Step 5: Solve for x
   x = 462,259,086.16/28,381.07
6. Step 6: Final answer
   x = 16,287.58