Finding the Fourth Proportional to 31,218.98, 46,827.38 and 13,688.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,218.98 : 46,827.38 = 13,688.96 : x
2. Step 2: Convert to fraction form
   31,218.98/46,827.38 = 13,688.96/x
3. Step 3: Cross multiply
   31,218.98x = 46,827.38 × 13,688.96
4. Step 4: Simplify right side
   31,218.98x = 641,018,131.72
5. Step 5: Solve for x
   x = 641,018,131.72/31,218.98
6. Step 6: Final answer
   x = 20,532.96