Finding the Fourth Proportional to 21,078.99, 31,609.85 and 7,924.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,078.99 : 31,609.85 = 7,924.59 : x
2. Step 2: Convert to fraction form
   21,078.99/31,609.85 = 7,924.59/x
3. Step 3: Cross multiply
   21,078.99x = 31,609.85 × 7,924.59
4. Step 4: Simplify right side
   21,078.99x = 250,495,061.59
5. Step 5: Solve for x
   x = 250,495,061.59/21,078.99
6. Step 6: Final answer
   x = 11,883.64