Finding the Fourth Proportional to 28,782.72, 43,179.98 and 12,142.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,782.72 : 43,179.98 = 12,142.76 : x
2. Step 2: Convert to fraction form
   28,782.72/43,179.98 = 12,142.76/x
3. Step 3: Cross multiply
   28,782.72x = 43,179.98 × 12,142.76
4. Step 4: Simplify right side
   28,782.72x = 524,323,857.33
5. Step 5: Solve for x
   x = 524,323,857.33/28,782.72
6. Step 6: Final answer
   x = 18,216.62