Finding the Fourth Proportional to 31,400.42, 46,910.82 and 20,215.94

Step by Step Solution

1. Step 1: Write the proportion equation
   31,400.42 : 46,910.82 = 20,215.94 : x
2. Step 2: Convert to fraction form
   31,400.42/46,910.82 = 20,215.94/x
3. Step 3: Cross multiply
   31,400.42x = 46,910.82 × 20,215.94
4. Step 4: Simplify right side
   31,400.42x = 948,346,221.39
5. Step 5: Solve for x
   x = 948,346,221.39/31,400.42
6. Step 6: Final answer
   x = 30,201.70