Finding the Fourth Proportional to 21,056.31, 31,567.69 and 12,161.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,056.31 : 31,567.69 = 12,161.52 : x
2. Step 2: Convert to fraction form
   21,056.31/31,567.69 = 12,161.52/x
3. Step 3: Cross multiply
   21,056.31x = 31,567.69 × 12,161.52
4. Step 4: Simplify right side
   21,056.31x = 383,911,062.89
5. Step 5: Solve for x
   x = 383,911,062.89/21,056.31
6. Step 6: Final answer
   x = 18,232.59