Finding the Fourth Proportional to 16,314.96, 24,420.50 and 12,990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,314.96 : 24,420.50 = 12,990.72 : x
2. Step 2: Convert to fraction form
   16,314.96/24,420.50 = 12,990.72/x
3. Step 3: Cross multiply
   16,314.96x = 24,420.50 × 12,990.72
4. Step 4: Simplify right side
   16,314.96x = 317,239,877.76
5. Step 5: Solve for x
   x = 317,239,877.76/16,314.96
6. Step 6: Final answer
   x = 19,444.72