Finding the Fourth Proportional to 31,006.89, 46,513.59 and 13,239.36

Step by Step Solution

1. Step 1: Write the proportion equation
   31,006.89 : 46,513.59 = 13,239.36 : x
2. Step 2: Convert to fraction form
   31,006.89/46,513.59 = 13,239.36/x
3. Step 3: Cross multiply
   31,006.89x = 46,513.59 × 13,239.36
4. Step 4: Simplify right side
   31,006.89x = 615,810,162.90
5. Step 5: Solve for x
   x = 615,810,162.90/31,006.89
6. Step 6: Final answer
   x = 19,860.43