Finding the Fourth Proportional to 21,580.89, 32,329.86 and 13,236.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,580.89 : 32,329.86 = 13,236.57 : x
2. Step 2: Convert to fraction form
   21,580.89/32,329.86 = 13,236.57/x
3. Step 3: Cross multiply
   21,580.89x = 32,329.86 × 13,236.57
4. Step 4: Simplify right side
   21,580.89x = 427,936,454.98
5. Step 5: Solve for x
   x = 427,936,454.98/21,580.89
6. Step 6: Final answer
   x = 19,829.42