Finding the Fourth Proportional to 21,838.95, 30,137.76 and 12,407.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,838.95 : 30,137.76 = 12,407.49 : x
2. Step 2: Convert to fraction form
   21,838.95/30,137.76 = 12,407.49/x
3. Step 3: Cross multiply
   21,838.95x = 30,137.76 × 12,407.49
4. Step 4: Simplify right side
   21,838.95x = 373,933,955.82
5. Step 5: Solve for x
   x = 373,933,955.82/21,838.95
6. Step 6: Final answer
   x = 17,122.34