Finding the Fourth Proportional to 21,837.52, 30,136.72 and 12,406.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,837.52 : 30,136.72 = 12,406.96 : x
2. Step 2: Convert to fraction form
   21,837.52/30,136.72 = 12,406.96/x
3. Step 3: Cross multiply
   21,837.52x = 30,136.72 × 12,406.96
4. Step 4: Simplify right side
   21,837.52x = 373,905,079.57
5. Step 5: Solve for x
   x = 373,905,079.57/21,837.52
6. Step 6: Final answer
   x = 17,122.14