Finding the Fourth Proportional to 100,759.28, 139,067.69 and 57,767.65

Step by Step Solution

1. Step 1: Write the proportion equation
   100,759.28 : 139,067.69 = 57,767.65 : x
2. Step 2: Convert to fraction form
   100,759.28/139,067.69 = 57,767.65/x
3. Step 3: Cross multiply
   100,759.28x = 139,067.69 × 57,767.65
4. Step 4: Simplify right side
   100,759.28x = 8,033,613,005.72
5. Step 5: Solve for x
   x = 8,033,613,005.72/100,759.28
6. Step 6: Final answer
   x = 79,730.75