Finding the Fourth Proportional to 21,743.94, 30,005.80 and 12,312.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,743.94 : 30,005.80 = 12,312.53 : x
2. Step 2: Convert to fraction form
   21,743.94/30,005.80 = 12,312.53/x
3. Step 3: Cross multiply
   21,743.94x = 30,005.80 × 12,312.53
4. Step 4: Simplify right side
   21,743.94x = 369,447,131.86
5. Step 5: Solve for x
   x = 369,447,131.86/21,743.94
6. Step 6: Final answer
   x = 16,990.81