Finding the Fourth Proportional to 21,393.57, 29,524.26 and 12,320.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,393.57 : 29,524.26 = 12,320.31 : x
2. Step 2: Convert to fraction form
   21,393.57/29,524.26 = 12,320.31/x
3. Step 3: Cross multiply
   21,393.57x = 29,524.26 × 12,320.31
4. Step 4: Simplify right side
   21,393.57x = 363,748,035.72
5. Step 5: Solve for x
   x = 363,748,035.72/21,393.57
6. Step 6: Final answer
   x = 17,002.68