Finding the Fourth Proportional to 21,799.14, 32,667.46 and 12,419.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,799.14 : 32,667.46 = 12,419.75 : x
2. Step 2: Convert to fraction form
   21,799.14/32,667.46 = 12,419.75/x
3. Step 3: Cross multiply
   21,799.14x = 32,667.46 × 12,419.75
4. Step 4: Simplify right side
   21,799.14x = 405,721,686.34
5. Step 5: Solve for x
   x = 405,721,686.34/21,799.14
6. Step 6: Final answer
   x = 18,611.82