Finding the Fourth Proportional to 21,941.64, 30,279.50 and 11,870.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,941.64 : 30,279.50 = 11,870.06 : x
2. Step 2: Convert to fraction form
   21,941.64/30,279.50 = 11,870.06/x
3. Step 3: Cross multiply
   21,941.64x = 30,279.50 × 11,870.06
4. Step 4: Simplify right side
   21,941.64x = 359,419,271.02
5. Step 5: Solve for x
   x = 359,419,271.02/21,941.64
6. Step 6: Final answer
   x = 16,380.69