Finding the Fourth Proportional to 21,983.78, 32,931.72 and 13,213.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,983.78 : 32,931.72 = 13,213.92 : x
2. Step 2: Convert to fraction form
   21,983.78/32,931.72 = 13,213.92/x
3. Step 3: Cross multiply
   21,983.78x = 32,931.72 × 13,213.92
4. Step 4: Simplify right side
   21,983.78x = 435,157,113.54
5. Step 5: Solve for x
   x = 435,157,113.54/21,983.78
6. Step 6: Final answer
   x = 19,794.46