Finding the Fourth Proportional to 67,139.16, 100,708.71 and 31,972.20

Step by Step Solution

1. Step 1: Write the proportion equation
   67,139.16 : 100,708.71 = 31,972.20 : x
2. Step 2: Convert to fraction form
   67,139.16/100,708.71 = 31,972.20/x
3. Step 3: Cross multiply
   67,139.16x = 100,708.71 × 31,972.20
4. Step 4: Simplify right side
   67,139.16x = 3,219,879,017.86
5. Step 5: Solve for x
   x = 3,219,879,017.86/67,139.16
6. Step 6: Final answer
   x = 47,958.29