Finding the Fourth Proportional to 21,040.71, 31,533.78 and 8,546.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,040.71 : 31,533.78 = 8,546.10 : x
2. Step 2: Convert to fraction form
   21,040.71/31,533.78 = 8,546.10/x
3. Step 3: Cross multiply
   21,040.71x = 31,533.78 × 8,546.10
4. Step 4: Simplify right side
   21,040.71x = 269,490,679.59
5. Step 5: Solve for x
   x = 269,490,679.59/21,040.71
6. Step 6: Final answer
   x = 12,808.06