Finding the Fourth Proportional to 22,329.72, 30,813.90 and 12,897.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,329.72 : 30,813.90 = 12,897.72 : x
2. Step 2: Convert to fraction form
   22,329.72/30,813.90 = 12,897.72/x
3. Step 3: Cross multiply
   22,329.72x = 30,813.90 × 12,897.72
4. Step 4: Simplify right side
   22,329.72x = 397,429,054.31
5. Step 5: Solve for x
   x = 397,429,054.31/22,329.72
6. Step 6: Final answer
   x = 17,798.21