Finding the Fourth Proportional to 21,941.72, 30,279.50 and 11,870.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,941.72 : 30,279.50 = 11,870.18 : x
2. Step 2: Convert to fraction form
   21,941.72/30,279.50 = 11,870.18/x
3. Step 3: Cross multiply
   21,941.72x = 30,279.50 × 11,870.18
4. Step 4: Simplify right side
   21,941.72x = 359,423,115.31
5. Step 5: Solve for x
   x = 359,423,115.31/21,941.72
6. Step 6: Final answer
   x = 16,380.81