Finding the Fourth Proportional to 21,212.07, 31,818.10 and 8,061.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,212.07 : 31,818.10 = 8,061.31 : x
2. Step 2: Convert to fraction form
   21,212.07/31,818.10 = 8,061.31/x
3. Step 3: Cross multiply
   21,212.07x = 31,818.10 × 8,061.31
4. Step 4: Simplify right side
   21,212.07x = 256,495,567.71
5. Step 5: Solve for x
   x = 256,495,567.71/21,212.07
6. Step 6: Final answer
   x = 12,091.96