Finding the Fourth Proportional to 21,307.59, 29,398.55 and 12,353.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,307.59 : 29,398.55 = 12,353.31 : x
2. Step 2: Convert to fraction form
   21,307.59/29,398.55 = 12,353.31/x
3. Step 3: Cross multiply
   21,307.59x = 29,398.55 × 12,353.31
4. Step 4: Simplify right side
   21,307.59x = 363,169,339.93
5. Step 5: Solve for x
   x = 363,169,339.93/21,307.59
6. Step 6: Final answer
   x = 17,044.13