Finding the Fourth Proportional to 21,572.53, 32,317.30 and 13,228.21

Step by Step Solution

1. Step 1: Write the proportion equation
   21,572.53 : 32,317.30 = 13,228.21 : x
2. Step 2: Convert to fraction form
   21,572.53/32,317.30 = 13,228.21/x
3. Step 3: Cross multiply
   21,572.53x = 32,317.30 × 13,228.21
4. Step 4: Simplify right side
   21,572.53x = 427,500,031.03
5. Step 5: Solve for x
   x = 427,500,031.03/21,572.53
6. Step 6: Final answer
   x = 19,816.87