Finding the Fourth Proportional to 21,742.01, 30,003.10 and 12,310.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,742.01 : 30,003.10 = 12,310.57 : x
2. Step 2: Convert to fraction form
   21,742.01/30,003.10 = 12,310.57/x
3. Step 3: Cross multiply
   21,742.01x = 30,003.10 × 12,310.57
4. Step 4: Simplify right side
   21,742.01x = 369,355,262.77
5. Step 5: Solve for x
   x = 369,355,262.77/21,742.01
6. Step 6: Final answer
   x = 16,988.09