Finding the Fourth Proportional to 21,784.31, 32,709.27 and 12,434.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,784.31 : 32,709.27 = 12,434.88 : x
2. Step 2: Convert to fraction form
   21,784.31/32,709.27 = 12,434.88/x
3. Step 3: Cross multiply
   21,784.31x = 32,709.27 × 12,434.88
4. Step 4: Simplify right side
   21,784.31x = 406,735,847.34
5. Step 5: Solve for x
   x = 406,735,847.34/21,784.31
6. Step 6: Final answer
   x = 18,671.05