Finding the Fourth Proportional to 31,587.12, 47,339.59 and 12,845.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,587.12 : 47,339.59 = 12,845.31 : x
2. Step 2: Convert to fraction form
   31,587.12/47,339.59 = 12,845.31/x
3. Step 3: Cross multiply
   31,587.12x = 47,339.59 × 12,845.31
4. Step 4: Simplify right side
   31,587.12x = 608,091,708.82
5. Step 5: Solve for x
   x = 608,091,708.82/31,587.12
6. Step 6: Final answer
   x = 19,251.26