Finding the Fourth Proportional to 31,623.38, 43,604.72 and 21,557.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,623.38 : 43,604.72 = 21,557.72 : x
2. Step 2: Convert to fraction form
   31,623.38/43,604.72 = 21,557.72/x
3. Step 3: Cross multiply
   31,623.38x = 43,604.72 × 21,557.72
4. Step 4: Simplify right side
   31,623.38x = 940,018,344.44
5. Step 5: Solve for x
   x = 940,018,344.44/31,623.38
6. Step 6: Final answer
   x = 29,725.42