Finding the Fourth Proportional to 12,567.72, 18,707.91 and 12,380.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,567.72 : 18,707.91 = 12,380.88 : x
2. Step 2: Convert to fraction form
   12,567.72/18,707.91 = 12,380.88/x
3. Step 3: Cross multiply
   12,567.72x = 18,707.91 × 12,380.88
4. Step 4: Simplify right side
   12,567.72x = 231,620,388.76
5. Step 5: Solve for x
   x = 231,620,388.76/12,567.72
6. Step 6: Final answer
   x = 18,429.79