Finding the Fourth Proportional to 21,428.30, 32,147.55 and 8,941.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,428.30 : 32,147.55 = 8,941.39 : x
2. Step 2: Convert to fraction form
   21,428.30/32,147.55 = 8,941.39/x
3. Step 3: Cross multiply
   21,428.30x = 32,147.55 × 8,941.39
4. Step 4: Simplify right side
   21,428.30x = 287,443,701.73
5. Step 5: Solve for x
   x = 287,443,701.73/21,428.30
6. Step 6: Final answer
   x = 13,414.21