Finding the Fourth Proportional to 30,765.72, 42,456.72 and 16,618.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,765.72 : 42,456.72 = 16,618.56 : x
2. Step 2: Convert to fraction form
   30,765.72/42,456.72 = 16,618.56/x
3. Step 3: Cross multiply
   30,765.72x = 42,456.72 × 16,618.56
4. Step 4: Simplify right side
   30,765.72x = 705,569,548.72
5. Step 5: Solve for x
   x = 705,569,548.72/30,765.72
6. Step 6: Final answer
   x = 22,933.63