Finding the Fourth Proportional to 21,300.02, 31,929.68 and 7,969.40

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.02 : 31,929.68 = 7,969.40 : x
2. Step 2: Convert to fraction form
   21,300.02/31,929.68 = 7,969.40/x
3. Step 3: Cross multiply
   21,300.02x = 31,929.68 × 7,969.40
4. Step 4: Simplify right side
   21,300.02x = 254,460,192.30
5. Step 5: Solve for x
   x = 254,460,192.30/21,300.02
6. Step 6: Final answer
   x = 11,946.48