Finding the Fourth Proportional to 30,916.24, 42,663.27 and 16,768.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,916.24 : 42,663.27 = 16,768.78 : x
2. Step 2: Convert to fraction form
   30,916.24/42,663.27 = 16,768.78/x
3. Step 3: Cross multiply
   30,916.24x = 42,663.27 × 16,768.78
4. Step 4: Simplify right side
   30,916.24x = 715,410,988.71
5. Step 5: Solve for x
   x = 715,410,988.71/30,916.24
6. Step 6: Final answer
   x = 23,140.30