Finding the Fourth Proportional to 31,141.28, 46,686.72 and 21,255.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,141.28 : 46,686.72 = 21,255.68 : x
2. Step 2: Convert to fraction form
   31,141.28/46,686.72 = 21,255.68/x
3. Step 3: Cross multiply
   31,141.28x = 46,686.72 × 21,255.68
4. Step 4: Simplify right side
   31,141.28x = 992,357,980.57
5. Step 5: Solve for x
   x = 992,357,980.57/31,141.28
6. Step 6: Final answer
   x = 31,866.32