Finding the Fourth Proportional to 20,973.15, 28,942.72 and 11,900.18

Step by Step Solution

1. Step 1: Write the proportion equation
   20,973.15 : 28,942.72 = 11,900.18 : x
2. Step 2: Convert to fraction form
   20,973.15/28,942.72 = 11,900.18/x
3. Step 3: Cross multiply
   20,973.15x = 28,942.72 × 11,900.18
4. Step 4: Simplify right side
   20,973.15x = 344,423,577.69
5. Step 5: Solve for x
   x = 344,423,577.69/20,973.15
6. Step 6: Final answer
   x = 16,422.12