Finding the Fourth Proportional to 28,165.82, 42,248.61 and 7,105.91

Step by Step Solution

1. Step 1: Write the proportion equation
   28,165.82 : 42,248.61 = 7,105.91 : x
2. Step 2: Convert to fraction form
   28,165.82/42,248.61 = 7,105.91/x
3. Step 3: Cross multiply
   28,165.82x = 42,248.61 × 7,105.91
4. Step 4: Simplify right side
   28,165.82x = 300,214,609.04
5. Step 5: Solve for x
   x = 300,214,609.04/28,165.82
6. Step 6: Final answer
   x = 10,658.83