Finding the Fourth Proportional to 30,930.24, 42,682.56 and 16,782.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,930.24 : 42,682.56 = 16,782.78 : x
2. Step 2: Convert to fraction form
   30,930.24/42,682.56 = 16,782.78/x
3. Step 3: Cross multiply
   30,930.24x = 42,682.56 × 16,782.78
4. Step 4: Simplify right side
   30,930.24x = 716,332,014.32
5. Step 5: Solve for x
   x = 716,332,014.32/30,930.24
6. Step 6: Final answer
   x = 23,159.60