Finding the Fourth Proportional to 31,139.28, 46,683.72 and 21,253.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.28 : 46,683.72 = 21,253.68 : x
2. Step 2: Convert to fraction form
   31,139.28/46,683.72 = 21,253.68/x
3. Step 3: Cross multiply
   31,139.28x = 46,683.72 × 21,253.68
4. Step 4: Simplify right side
   31,139.28x = 992,200,846.09
5. Step 5: Solve for x
   x = 992,200,846.09/31,139.28
6. Step 6: Final answer
   x = 31,863.32