Finding the Fourth Proportional to 21,983.76, 32,988.69 and 8,142.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,983.76 : 32,988.69 = 8,142.48 : x
2. Step 2: Convert to fraction form
   21,983.76/32,988.69 = 8,142.48/x
3. Step 3: Cross multiply
   21,983.76x = 32,988.69 × 8,142.48
4. Step 4: Simplify right side
   21,983.76x = 268,609,748.55
5. Step 5: Solve for x
   x = 268,609,748.55/21,983.76
6. Step 6: Final answer
   x = 12,218.55