Finding the Fourth Proportional to 21,423.33, 32,124.47 and 12,655.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,423.33 : 32,124.47 = 12,655.89 : x
2. Step 2: Convert to fraction form
   21,423.33/32,124.47 = 12,655.89/x
3. Step 3: Cross multiply
   21,423.33x = 32,124.47 × 12,655.89
4. Step 4: Simplify right side
   21,423.33x = 406,563,695.35
5. Step 5: Solve for x
   x = 406,563,695.35/21,423.33
6. Step 6: Final answer
   x = 18,977.61