Finding the Fourth Proportional to 21,667.57, 32,496.66 and 12,655.66

Step by Step Solution

1. Step 1: Write the proportion equation
   21,667.57 : 32,496.66 = 12,655.66 : x
2. Step 2: Convert to fraction form
   21,667.57/32,496.66 = 12,655.66/x
3. Step 3: Cross multiply
   21,667.57x = 32,496.66 × 12,655.66
4. Step 4: Simplify right side
   21,667.57x = 411,266,680.10
5. Step 5: Solve for x
   x = 411,266,680.10/21,667.57
6. Step 6: Final answer
   x = 18,980.75