Finding the Fourth Proportional to 28,105.74, 42,160.26 and 10,575.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,105.74 : 42,160.26 = 10,575.72 : x
2. Step 2: Convert to fraction form
   28,105.74/42,160.26 = 10,575.72/x
3. Step 3: Cross multiply
   28,105.74x = 42,160.26 × 10,575.72
4. Step 4: Simplify right side
   28,105.74x = 445,875,104.89
5. Step 5: Solve for x
   x = 445,875,104.89/28,105.74
6. Step 6: Final answer
   x = 15,864.20