Finding the Fourth Proportional to 21,386.50, 29,513.37 and 13,003

Step by Step Solution

1. Step 1: Write the proportion equation
   21,386.50 : 29,513.37 = 13,003 : x
2. Step 2: Convert to fraction form
   21,386.50/29,513.37 = 13,003/x
3. Step 3: Cross multiply
   21,386.50x = 29,513.37 × 13,003
4. Step 4: Simplify right side
   21,386.50x = 383,762,350.11
5. Step 5: Solve for x
   x = 383,762,350.11/21,386.50
6. Step 6: Final answer
   x = 17,944.14