Finding the Fourth Proportional to 40,742.72, 56,119.78 and 28,785.30

Step by Step Solution

1. Step 1: Write the proportion equation
   40,742.72 : 56,119.78 = 28,785.30 : x
2. Step 2: Convert to fraction form
   40,742.72/56,119.78 = 28,785.30/x
3. Step 3: Cross multiply
   40,742.72x = 56,119.78 × 28,785.30
4. Step 4: Simplify right side
   40,742.72x = 1,615,424,703.23
5. Step 5: Solve for x
   x = 1,615,424,703.23/40,742.72
6. Step 6: Final answer
   x = 39,649.41