Finding the Fourth Proportional to 70,590.70, 105,906.78 and 28,449.09

Step by Step Solution

1. Step 1: Write the proportion equation
   70,590.70 : 105,906.78 = 28,449.09 : x
2. Step 2: Convert to fraction form
   70,590.70/105,906.78 = 28,449.09/x
3. Step 3: Cross multiply
   70,590.70x = 105,906.78 × 28,449.09
4. Step 4: Simplify right side
   70,590.70x = 3,012,951,879.25
5. Step 5: Solve for x
   x = 3,012,951,879.25/70,590.70
6. Step 6: Final answer
   x = 42,681.99