Finding the Fourth Proportional to 15,978.96, 24,003 and 13,518.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15,978.96 : 24,003 = 13,518.72 : x
2. Step 2: Convert to fraction form
   15,978.96/24,003 = 13,518.72/x
3. Step 3: Cross multiply
   15,978.96x = 24,003 × 13,518.72
4. Step 4: Simplify right side
   15,978.96x = 324,489,836.16
5. Step 5: Solve for x
   x = 324,489,836.16/15,978.96
6. Step 6: Final answer
   x = 20,307.32