Finding the Fourth Proportional to 21,591.57, 32,329.71 and 12,699.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,591.57 : 32,329.71 = 12,699.48 : x
2. Step 2: Convert to fraction form
   21,591.57/32,329.71 = 12,699.48/x
3. Step 3: Cross multiply
   21,591.57x = 32,329.71 × 12,699.48
4. Step 4: Simplify right side
   21,591.57x = 410,570,505.55
5. Step 5: Solve for x
   x = 410,570,505.55/21,591.57
6. Step 6: Final answer
   x = 19,015.32