Finding the Fourth Proportional to 21,339.50, 29,448.34 and 12,387.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,339.50 : 29,448.34 = 12,387.83 : x
2. Step 2: Convert to fraction form
   21,339.50/29,448.34 = 12,387.83/x
3. Step 3: Cross multiply
   21,339.50x = 29,448.34 × 12,387.83
4. Step 4: Simplify right side
   21,339.50x = 364,800,967.76
5. Step 5: Solve for x
   x = 364,800,967.76/21,339.50
6. Step 6: Final answer
   x = 17,095.11