Finding the Fourth Proportional to 21,385, 29,525.88 and 13,016.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,385 : 29,525.88 = 13,016.08 : x
2. Step 2: Convert to fraction form
   21,385/29,525.88 = 13,016.08/x
3. Step 3: Cross multiply
   21,385x = 29,525.88 × 13,016.08
4. Step 4: Simplify right side
   21,385x = 384,311,216.15
5. Step 5: Solve for x
   x = 384,311,216.15/21,385
6. Step 6: Final answer
   x = 17,971.06