Finding the Fourth Proportional to 21,385.50, 29,511.99 and 13,002

Step by Step Solution

1. Step 1: Write the proportion equation
   21,385.50 : 29,511.99 = 13,002 : x
2. Step 2: Convert to fraction form
   21,385.50/29,511.99 = 13,002/x
3. Step 3: Cross multiply
   21,385.50x = 29,511.99 × 13,002
4. Step 4: Simplify right side
   21,385.50x = 383,714,893.98
5. Step 5: Solve for x
   x = 383,714,893.98/21,385.50
6. Step 6: Final answer
   x = 17,942.76