Finding the Fourth Proportional to 21,118.74, 31,667.46 and 7,791.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,118.74 : 31,667.46 = 7,791.06 : x
2. Step 2: Convert to fraction form
   21,118.74/31,667.46 = 7,791.06/x
3. Step 3: Cross multiply
   21,118.74x = 31,667.46 × 7,791.06
4. Step 4: Simplify right side
   21,118.74x = 246,723,080.91
5. Step 5: Solve for x
   x = 246,723,080.91/21,118.74
6. Step 6: Final answer
   x = 11,682.66