Finding the Fourth Proportional to 21,449.31, 29,599.50 and 12,018.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,449.31 : 29,599.50 = 12,018.48 : x
2. Step 2: Convert to fraction form
   21,449.31/29,599.50 = 12,018.48/x
3. Step 3: Cross multiply
   21,449.31x = 29,599.50 × 12,018.48
4. Step 4: Simplify right side
   21,449.31x = 355,740,998.76
5. Step 5: Solve for x
   x = 355,740,998.76/21,449.31
6. Step 6: Final answer
   x = 16,585.20