Finding the Fourth Proportional to 21,290.80, 29,384.73 and 12,343.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,290.80 : 29,384.73 = 12,343.48 : x
2. Step 2: Convert to fraction form
   21,290.80/29,384.73 = 12,343.48/x
3. Step 3: Cross multiply
   21,290.80x = 29,384.73 × 12,343.48
4. Step 4: Simplify right side
   21,290.80x = 362,709,827.06
5. Step 5: Solve for x
   x = 362,709,827.06/21,290.80
6. Step 6: Final answer
   x = 17,035.99