Finding the Fourth Proportional to 13,784.78, 20,671.07 and 3,921.82

Step by Step Solution

1. Step 1: Write the proportion equation
   13,784.78 : 20,671.07 = 3,921.82 : x
2. Step 2: Convert to fraction form
   13,784.78/20,671.07 = 3,921.82/x
3. Step 3: Cross multiply
   13,784.78x = 20,671.07 × 3,921.82
4. Step 4: Simplify right side
   13,784.78x = 81,068,144.46
5. Step 5: Solve for x
   x = 81,068,144.46/13,784.78
6. Step 6: Final answer
   x = 5,880.99