Finding the Fourth Proportional to 21,672.42, 32,513.17 and 12,316.77

Step by Step Solution

1. Step 1: Write the proportion equation
   21,672.42 : 32,513.17 = 12,316.77 : x
2. Step 2: Convert to fraction form
   21,672.42/32,513.17 = 12,316.77/x
3. Step 3: Cross multiply
   21,672.42x = 32,513.17 × 12,316.77
4. Step 4: Simplify right side
   21,672.42x = 400,457,043.50
5. Step 5: Solve for x
   x = 400,457,043.50/21,672.42
6. Step 6: Final answer
   x = 18,477.73