Finding the Fourth Proportional to 21,456.18, 32,191.56 and 6,667.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,456.18 : 32,191.56 = 6,667.20 : x
2. Step 2: Convert to fraction form
   21,456.18/32,191.56 = 6,667.20/x
3. Step 3: Cross multiply
   21,456.18x = 32,191.56 × 6,667.20
4. Step 4: Simplify right side
   21,456.18x = 214,627,568.83
5. Step 5: Solve for x
   x = 214,627,568.83/21,456.18
6. Step 6: Final answer
   x = 10,003.07