Finding the Fourth Proportional to 21,423.84, 32,132.60 and 12,543.27

Step by Step Solution

1. Step 1: Write the proportion equation
   21,423.84 : 32,132.60 = 12,543.27 : x
2. Step 2: Convert to fraction form
   21,423.84/32,132.60 = 12,543.27/x
3. Step 3: Cross multiply
   21,423.84x = 32,132.60 × 12,543.27
4. Step 4: Simplify right side
   21,423.84x = 403,047,814.89
5. Step 5: Solve for x
   x = 403,047,814.89/21,423.84
6. Step 6: Final answer
   x = 18,813.05