Finding the Fourth Proportional to 31,851.16, 47,797.55 and 12,129.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,851.16 : 47,797.55 = 12,129.91 : x
2. Step 2: Convert to fraction form
   31,851.16/47,797.55 = 12,129.91/x
3. Step 3: Cross multiply
   31,851.16x = 47,797.55 × 12,129.91
4. Step 4: Simplify right side
   31,851.16x = 579,779,979.72
5. Step 5: Solve for x
   x = 579,779,979.72/31,851.16
6. Step 6: Final answer
   x = 18,202.79