Finding the Fourth Proportional to 21,945.72, 30,275.33 and 13,985.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,945.72 : 30,275.33 = 13,985.04 : x
2. Step 2: Convert to fraction form
   21,945.72/30,275.33 = 13,985.04/x
3. Step 3: Cross multiply
   21,945.72x = 30,275.33 × 13,985.04
4. Step 4: Simplify right side
   21,945.72x = 423,401,631.14
5. Step 5: Solve for x
   x = 423,401,631.14/21,945.72
6. Step 6: Final answer
   x = 19,293.13