Finding the Fourth Proportional to 21,799.32, 32,667.72 and 12,419.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,799.32 : 32,667.72 = 12,419.94 : x
2. Step 2: Convert to fraction form
   21,799.32/32,667.72 = 12,419.94/x
3. Step 3: Cross multiply
   21,799.32x = 32,667.72 × 12,419.94
4. Step 4: Simplify right side
   21,799.32x = 405,731,122.34
5. Step 5: Solve for x
   x = 405,731,122.34/21,799.32
6. Step 6: Final answer
   x = 18,612.10