Finding the Fourth Proportional to 31,288.94, 46,939.54 and 13,758.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,288.94 : 46,939.54 = 13,758.72 : x
2. Step 2: Convert to fraction form
   31,288.94/46,939.54 = 13,758.72/x
3. Step 3: Cross multiply
   31,288.94x = 46,939.54 × 13,758.72
4. Step 4: Simplify right side
   31,288.94x = 645,827,987.79
5. Step 5: Solve for x
   x = 645,827,987.79/31,288.94
6. Step 6: Final answer
   x = 20,640.78