Finding the Fourth Proportional to 21,507.46, 32,224.78 and 13,170.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,507.46 : 32,224.78 = 13,170.07 : x
2. Step 2: Convert to fraction form
   21,507.46/32,224.78 = 13,170.07/x
3. Step 3: Cross multiply
   21,507.46x = 32,224.78 × 13,170.07
4. Step 4: Simplify right side
   21,507.46x = 424,402,608.33
5. Step 5: Solve for x
   x = 424,402,608.33/21,507.46
6. Step 6: Final answer
   x = 19,732.81