Finding the Fourth Proportional to 39,559.12, 59,306.16 and 18,488.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,559.12 : 59,306.16 = 18,488.72 : x
2. Step 2: Convert to fraction form
   39,559.12/59,306.16 = 18,488.72/x
3. Step 3: Cross multiply
   39,559.12x = 59,306.16 × 18,488.72
4. Step 4: Simplify right side
   39,559.12x = 1,096,494,986.52
5. Step 5: Solve for x
   x = 1,096,494,986.52/39,559.12
6. Step 6: Final answer
   x = 27,717.88