Finding the Fourth Proportional to 21,916.31, 30,244.43 and 12,357.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,916.31 : 30,244.43 = 12,357.23 : x
2. Step 2: Convert to fraction form
   21,916.31/30,244.43 = 12,357.23/x
3. Step 3: Cross multiply
   21,916.31x = 30,244.43 × 12,357.23
4. Step 4: Simplify right side
   21,916.31x = 373,737,164.72
5. Step 5: Solve for x
   x = 373,737,164.72/21,916.31
6. Step 6: Final answer
   x = 17,052.93